Butterfly gardening explained

Butterfly gardening is a way to create, improve, and maintain habitat for lepidopterans including butterflies, skippers, and moths.[1] Butterflies have four distinct life stages—egg, larva, chrysalis, and adult. In order to support and sustain butterfly populations, an ideal butterfly garden contains habitat for each life stage.

Butterfly larvae, with some exceptions such as the carnivorous harvester (Feniseca tarquinius), consume plant matter and can be generalists or specialists. While butterflies like the painted lady (Vanessa cardui)[2] are known to consume over 200 plants as caterpillars, other species like the monarch (Danaus plexippus),[3] and the regal fritillary (Speyeria idalia)[4] only consume plants in one genus, milkweed and violets, respectively.

As adults, butterflies feed mainly on nectar, but they have also evolved to consume rotting fruit, tree sap, and even carrion.[5] Supporting nectarivorous adult butterflies involves planting nectar plants of different heights, color, and bloom times. Butterfly bait stations can easily be made to provide a food source for species that prefer fruit and sap. In addition to food sources, windbreaks in the form of trees and shrubs shelter butterflies and can provide larval food and overwintering grounds.[6] "Puddling" is a behavior generally done by male butterflies in which they gather to drink nutrients and water and incorporating a puddling ground for butterflies will enhance a butterfly garden.[7] [8] While butterflies are not the only pollinators, creating butterfly habitat also creates habitat for bees, beetles, flies, and other pollinators.

Reasoning

Butterfly gardening provides a recreational activity to view butterflies interacting with the environment. Besides anthropocentric values of butterfly gardening, creating habitat reduces the impacts of habitat fragmentation and degradation. Habitat degradation is a multivariate issue; development, increased use of pesticides and herbicides, woody encroachment, and non-native plants are contributing factors to the decline in butterfly and pollinator habitat.[9] Pollination is one ecological service butterflies provide; about 90% of flowering plants and 35% of crops rely on animal pollination.[9] [10] Butterfly gardens and monarch waystations, even in developed urban areas, provide habitat[11] that increases the diversity of butterflies and other pollinators, including bees, flies, and beetles.[12]

Ground-truthing

Before buying plants and digging into the soil, "ground-truthing" is a necessary first step, Ground-truthing involves surveying a property in order to assess the current resources available. Some aspects to keep in mind are the following:

Butterflies are ectothermic and rely on solar radiation for their metabolism. South-facing slopes are an ideal location for a butterfly garden, as they provide the most solar radiation (in the Northern Hemisphere; the opposite is true in the Southern Hemisphere). Where native, shrubs and trees such as spicebush (Lindera benzoin), pawpaw (Asimina triloba), sassafras (Sassafras albidum), and black cherry (Prunus serotina), provide windbreaks for butterflies and can also be their host plants.[13] [14]

Plants

The types of plants used in a butterfly garden will determine the species of butterflies that will visit the garden. Lepidoptera societies and the PLANTS Database of the United States Department of Agriculture's (USDA's) Natural Resources Conservation Service provide state and county-level distribution maps of specific plants.[15] Published lists of host plants for butterflies and other pollinators can help select the plant species desired in the garden.[16] While non-native plants can provide floral resources to a garden, they can also have an overall negative effect on butterflies and other pollinators. Therefore, it is often recommended to use native plants. It is also important to check invasive species lists to ensure that plants are not invasive in a given locality or region. The Invasive Plant Atlas of the United States and similar publications can help provide such information.[17]

Depending on the zone, some butterfly-attracting plants include: purple cone flower (Echinacea purpurea), buttonbush (Cephalanthus occidentalis), yellow cone flowers, sunflowers, marigolds, poppies, cosmos, salvias, some lilies, asters, coreopsis, daisies, joe pye weed (Eutrochium), verbenas, blue mist shrub (Caryopteris × clandonensis), lantanas, liatris, milkweed (especially for the monarch butterfly, whose caterpillars feed solely on this plant), zinnias, pentas, porterweeds, and others.[18] A USDA conservation planting guide for Maryland recommends that, for optimum wildlife and pollinator habitat in mesic sites (especially for monarchs), a seed mix should contain 6.0% common milkweed (Asclepias syriaca) by weight and 2.0% by seed.[19] Another such USDA guide for Maryland states that for herbaceous plantings, non-competitive bunch grasses (e.g., broomsedge (Andropogon virginicus), little bluestem (Schizachyrium scoparium), purpletop (Tridens flavus)) may be included in a seed mix for native plants at a low rate — less than 25% of the mix based on pure live seed per square foot (0.9 square meters).[20]

The eastern monarch migration largely depends upon only three milkweed species: common milkweed (Asclepias syriaca), green antelope horn milkweed (A. viridis), and antelope horns milkweed (A. asperula).[21] Butterfly gardens and monarch waystations in eastern and central North America should therefore feature one or more of those species, depending upon the areas in which the species are native.

Install flowering native trees and shrubs that also feed native butterfly caterpillars. For example, black cherry (Prunus serotina), a tree that is native to most of the eastern half of the United States, has white flowers that provide nectar to pollinators during the spring. P. serotina hosts the caterpillars of more than 450 species of butterflies and moths, including those of the eastern tiger swallowtail (Papilio glaucus), red-spotted purple/white admiral (Limenitis arthemis), viceroy (Limenitis archippus), and cherry gall azure (Celastrina serotina) butterflies and the cecropia (Hyalophora cecropia), promethea silkmoth (Callosamia promethea), polyphemus (Antheraea polyphemus), small-eyed sphinx (Paonias myops), wild cherry sphinx (Sphinx drupiferarum), banded tussock (Halysidota tessellaris), spotted apatelodes (Apatelodes torrefacta), and band-edged prominent moths.[22]

Sassafras (Sassafras albidum), a tree that is native to the eastern half of the United States, has yellow, green, and brown flowers that provide nectar to pollinators during the spring. S. albidum hosts the caterpillars of 37 species of butterflies and moths, including the eastern tiger swallowtail, spicebush swallowtail (Papilio troilus), palamedes swallowtail (Papilio palamedes) and pale swallowtail (Papilio eurymedon) butterflies and the cecropia, promethea silkmoth, polyphemus, imperial (Eacles imperialis), and io (Automeris io) moths.[23]

Spicebush (Lindera benzoin), a shrub that is native to the eastern half of the United States, has white, yellow, and green flowers that also provide nectar to pollinators during the spring. L. benzoin hosts the caterpillars of the spicebush swallowtail and eastern tiger swallowtail butterflies and the promethea silkmoth.[24] Avoid cultivars of plants unless they are more resistant to diseases than their native parents or that investigations have proven to be more beneficial to pollinators than their parents. Many cultivars are sterile and produce no nectar or pollen. As a result, their flowers do not benefit butterflies and other pollinators. Some have "double flowers". Their reproductive parts have been converted into extra petals and therefore do not produce floral rewards for pollinators. Some cultivars have reduced nutritional benefits, and have not been studied enough to identify those that may be harming pollinators.[25]

Cultivars with features that significantly affect flower structure and/or color are those that are likely to alter their appeal to pollinators. Those selected for foliage color may be toxic to insects. Studies have shown that altering leaf color, and the chemical changes that this implies, reduces a plant’s ability to serve as a resource for herbivorous insects.[26]

Buddleja davidii, which is often called "butterfly-bush", attracts many butterflies.[27] As it originated in China, it is presently planted in many parts of the world in which it is non-native.[27] In such settings, the plant feeds many native butterflies and other adult pollinators, but not many of their larvae.[28] As B. davidii is invasive in some areas, plantings of the species are controversial.[28] [29] To prevent seeding and to promote further flowering, its blossoms need to be removed ("deadheaded") as soon as they are spent.[27]

A number of Buddleja cultivars have become available that have a variety of sizes and blossom colors. University studies have suggested that nectaring butterflies have greater preferences for some of these than for others, with Lo & Behold 'Blue Chip' and 'Pink Delight' heading a list of eleven.[30]

Some Buddleja cultivars are either sterile or produce less than 2% viable seed (see "Non-invasive" Buddleja cultivars).[27] [28] [31] [32] The state of Oregon, which designates B. davidii as a "noxious weed" and initially prohibited entry, transport, purchase, sale or propagation of all of its varieties, amended its quarantine in 2009 to permit those cultivars when approved or when proven to be interspecific hybrids.[27] [28] [31] [33] Monarch Watch recommends planting only male-sterile "Flutterby" cultivars.[34]

It is important to avoid purchasing plants and seeds treated with insecticides such as neonicotinoids. Although not yet conclusive, there is increasing evidence that neonicotinoids can have negative effects on pollinating insects, including butterflies.[35]

Puddling

"Puddling" refers to the behavior of male butterflies congregating on wet soil, dung, and carrion to feed on nutrients, specifically sodium. Nectar is low in sodium, and sodium is a limiting nutrient for Lepidoptera. Male butterflies are able to transfer sodium to females during copulation. The sodium is passed onto offspring and increases reproductive success. To create a simple puddling habitat, fill a shallow dish (like a draining tray for a pot) with wet sand. To increase the nutrients, mix compost with the sand. Add footholds for butterflies by adding different sized rocks.

Baiting

There are numerous recipes for creating butterfly bait, but they have common ingredients. Fermentation is the key to a good bait, as it mimics the fermentation of rotting fruit and sap in the natural environment.[36] Recipes include blending rotten fruit (i.e. bananas) with beer, maple syrup, molasses, or sugar. Often yeast is added as well to the mixture and left to ferment for a week. Urine is also known to attract fruit-feeding butterflies.[37] The bait can be laid on stumps, rocks, and tree limbs.

Problems

There are diseases that afflict butterflies, such as bacteria in the genus Pseudomonas, the nuclear polyhedrosis virus, and Ophryocystis elektroscirrha, which only infects queen butterflies and monarch butterflies.

In the absence of pesticides, aphids and true bugs may infest plants. Some gardeners release ladybugs (ladybirds) and other biological pest control agents that do not harm butterflies in order to control aphids. However, the release of ladybugs is not desirable in the United States and in many other locations, where the invasive Chinese ladybug (Harmonia axyridis) is often the species released. Perhaps more importantly, ladybugs and other predatory or parasitic insects can prey on butterfly and moth caterpillars and pupae even if they do not do so on adult Lepidoptera.

As an alternative, one can wait for local predatory insects to find the aphids. One can hasten this process if an infestation is high by spraying the plants with a mix of sugar and water, simulating aphid honeydew. This is known to attract lacewings whose larvae eat aphids.[38]

One can also spray the plants with water, or rinse the plants with a mild detergent/water solution (although caterpillars should be relocated before suds are applied). Scented detergents are acceptable; those containing OxiClean should be avoided. The aphids will turn black within a day, and eventually fall off. Another technique is to plant a variety of different flowers, including ones that attract hoverflies and parasitic braconid wasps (Braconidae), whose larvae kill pest species. Further, some caterpillars such as those of the harvester butterfly (Feniseca tarquinius) feed on certain species of aphids, but not on plants.[39]

Caterpillars can exhaust their source of food in small home gardens before metamorphosis occurs. Installing multiple plants can help reduce the chance of running out of leaves. If raising monarchs, one can replace the expended milkweed with a slice of pumpkin or cucumber, which can serve as a substitute source of food for monarch caterpillars in their final (fifth) instar.[40]

Plantings of tropical milkweed/bloodflower (A. curassavica) are problematic. Where planted or naturalized in the southern United States, the non-native A. curassavica hosts monarch reproduction throughout the winter. This may alter the butterflies' migratory and breeding instincts, thus causing them to avoid migration and subsequent breeding and to increase their risk of infection.[41]

Monarch Watch provides information on rearing monarchs and their host plants.[42] Efforts to restore falling butterfly populations by establishing butterfly gardens and migrating monarch "waystations" require particular attention to the target species' food preferences and population cycles, as well to the conditions needed to propagate and maintain their food plants.[43]

Awareness of different milkweed species is of vital importance. For example, in the Washington, D.C., area and elsewhere in the northeastern and midwestern United States, common milkweed (Asclepias syriaca) is among the most important food plants for monarch caterpillars,[44] especially when its foliage is soft and fresh. As monarch reproduction in that area peaks in late summer, when most A. syriaca leaves are old and tough, the plant needs to be cut back in June, July, or August, to assure that it will be regrowing rapidly, when monarch reproduction reaches its peak. Similar conditions exist for showy milkweed (A. speciosa) in Michigan and for green antelopehorn milkweed (A. viridis) where it grows in the southern Great Plains and the western United States.[45] In addition, the seeds of A. syriaca and some other milkweeds need periods of cold treatment (cold stratification) before they will germinate.[46]

To protect seeds from washing away during heavy rains and from seed-eating birds, one can cover the seeds with a light fabric or with an 0.50NaN0 layer of straw mulch.[47] However, mulch acts as an insulator. Thicker layers of mulch can prevent seeds from germinating if they prevent soil temperatures from rising enough when winter ends. Further, few seedlings can push through a thick layer of mulch.[48]

Many species of milkweed contain toxic cardiac glycosides (cardenolides). Monarch caterpillars deter predators by incorporating these chemical compounds into their bodies, where the toxins remain throughout the insect's lifetime.[49] Although monarch caterpillars will feed on butterfly weed (A. tuberosa) in butterfly gardens, it is typically not a heavily used host plant for the species.[50] The plant contains only low levels of cardiac glycosides. This may make A. tuberosa unattractive to egg-laying monarchs.[51] Some other milkweeds have similar characteristics.[52]

A. tuberosa also has rough leaves and a layer of trichomes, which may inhibit oviposition or decrease a female's ability to sense leaf chemicals.[53] [54] As a result of these factors, reproducing monarchs lay fewer eggs on A. tuberosa than they do on most other milkweeds.[53] [50] While the plant's colorful flowers provide nectar for many adult butterflies, A. tuberosa may therefore be less suitable for use in butterfly gardens and monarch waystations than are other milkweed species.[53]

Breeding monarchs prefer to lay eggs on swamp milkweed (A. incarnata).[55] A. incarnata is therefore often planted in butterfly gardens and monarch waystations to help sustain the butterfly's populations.[56] [57]

However, A. incarnata is an early successional plant that usually grows at the margins of wetlands and in seasonally flooded areas. The plant is slow to spread via seeds, does not spread by runners and tends to disappear as vegetative densities increase and habitats dry out.[58] Although A. incarnata plants can survive for up to 20 years, most live only two-five years in gardens. The species is not shade-tolerant and is not a good vegetative competitor.[58]

Books

See also

References

Book: Eric. Mader. Mathew. Shepherd. Mace. Vaughan. Scott Hoffman. Black. Gretchen. LeBuhn. Attracting Native Pollinators: Protecting North America's Bees and Butterflies: The Xerces Society guide. 2011. 9781603427470. 776997073. 2010043054. North Adams, Massachusetts. Workman Publishing Company: Storey Publishing. Internet Archive. July 7, 2021.

External links

Notes and References

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  2. Krenn . Harald W. . Proboscis musculature in the butterfly Vanessa cardui (Nymphalidae, Lepidoptera): settling the proboscis recoiling controversy: Proboscis musculature in Vanessa cardui . Acta Zoologica . 24 December 2001 . 81 . 3 . 259–266 . 10.1046/j.1463-6395.2000.00055.x .
  3. Web site: Northeast Region Milkweed Species. Monarch Joint Venture. https://web.archive.org/web/20150521014203/http://monarchjointventure.org/images/uploads/documents/MilkweedFactSheetFINAL.pdf. May 21, 2015. live.
  4. Solis-Gabriel . Lizet . Mendoza-Arroyo . Wendy . Boege . Karina . del-Val . Ek . Restoring lepidopteran diversity in a tropical dry forest: relative importance of restoration treatment, tree identity and predator pressure . PeerJ . 24 May 2017 . 5 . e3344 . 10.7717/peerj.3344 . 28560101 . 5445945 . free .
  5. Ômura. Hisashi. Honda. Keiichi. November 2003. Feeding responses of adult butterflies, Nymphalis xanthomelas, Kaniska canace and Vanessa indica, to components in tree sap and rotting fruits: synergistic effects of ethanol and acetic acid on sugar responsiveness. Journal of Insect Physiology. 49. 11. 1031–1038. 10.1016/j.jinsphys.2003.07.001. 14568581. 2003JInsP..49.1031O .
  6. https://archive.org/details/attractingnative0000unse/page/263/mode/1up Mader, p. 263
  7. Pivnick . Kenneth A. . McNeil . Jeremy N. . Puddling in butterflies: sodium affects reproductive success in Thymelicus lineola* . Physiological Entomology . December 1987 . 12 . 4 . 461–472 . 10.1111/j.1365-3032.1987.tb00773.x . 85228518 .
  8. Smedley . S. R. . Eisner . T. . Sodium Uptake by Puddling in a Moth . Science . 15 December 1995 . 270 . 5243 . 1816–1818 . 10.1126/science.270.5243.1816 . 8525374 . 1995Sci...270.1816S . 46385297 .
  9. Hanula . James L. . Ulyshen . Michael D. . Horn . Scott . Conserving Pollinators in North American Forests: A Review . Natural Areas Journal . October 2016 . 36 . 4 . 427–439 . 10.3375/043.036.0409 . 12503098 .
  10. Nicholls . Clara I. . Altieri . Miguel A. . Plant biodiversity enhances bees and other insect pollinators in agroecosystems. A review . Agronomy for Sustainable Development . April 2013 . 33 . 2 . 257–274 . 10.1007/s13593-012-0092-y . 2013AgSD...33..257N . 11207837 .
  11. Geest . Emily A. . Wolfenbarger . L. LaReesa . McCarty . John P. . April 2019 . Recruitment, survival, and parasitism of monarch butterflies (Danaus plexippus) in milkweed gardens and conservation areas . Journal of Insect Conservation . en . 23 . 2 . 211–224 . 10.1007/s10841-018-0102-8 . 53633525 . 1366-638X. free . 2019JICon..23..211G .
  12. Matteson . Kevin C. . Langellotto . Gail A. . Determinates of inner city butterfly and bee species richness . Urban Ecosystems . September 2010 . 13 . 3 . 333–347 . 10.1007/s11252-010-0122-y . free . 2010UrbEc..13..333M .
  13. Book: Attracting native pollinators : protecting North America's bees and butterflies : the Xerces Society guide . 2011 . North Adams, MA . Storey Pub. . 978-1-60342-695-4.
  14. Book: Wagner, David L.. Caterpillars of Eastern North America: A Guide To Identification and Natural History. 2005. Princeton University Press. 0691121435. Princeton. 10.1515/9781400834143. 697174368.
  15. Web site: United States Department of Agriculture

    Natural Resources Conservation Service

    . PLANTS Database. October 16, 2024. https://web.archive.org/web/20241007160459/https://plants.usda.gov/home. October 7, 2024. live.
  16. Multiple sources:

    Note: Only select plants that are checked in column “N” (Native).

    Note: See the Monarch Planting List, the Flower Color Chart, and the description and pollinator value of each cited plant species in the documents entitled "Important Plants and Plant Lists for the Monarch Butterfly" for the Web site: Greater Appalachian Mountains Region. the Web site: Midwest Region. , the Web site: September 2019 addendum for the Midwest Region. , the Web site: Northern Great Plains Region. , the Web site: Southern Great Plains Region. , and the Web site: Western Coastal Plain Region. .

    Note: Document contains links to native plant lists for 21 regions in the United States.

    Note: Document contains links to native plant lists and other information for 36 ecological regions in the United States and 28 in Canada.

  17. Web site: Invasive Plant Atlas of the United States. invasiveplantatlas.org. October 15, 2024. https://web.archive.org/web/20240909044917/https://www.invasiveplantatlas.org/. September 9, 2024. live.
  18. Multiple sources:
  19. Book: United States Department of Agriculture. United States Department of Agriculture. December 2022. Maryland Conservation Planting Guide. Mix 16: High Diversity Native Grass/Forb Mix for Mesic Sites. 19. https://web.archive.org/web/20240106191922/https://efotg.sc.egov.usda.gov/references/public/MW/MD_Conservation_Planting_Guide_12_20_22.pdf. January 6, 2024. live. This mix has a predominant wildflower component for optimum wildlife and pollinator habitat..
  20. Book: United States Department of Agriculture. United States Department of Agriculture. January 2023. Maryland Wildflower Habitat Establishment Guide: Planting for Pollinators and Beneficial Insects. 5. October 17, 2024. https://web.archive.org/web/20240927211335/https://efotg.sc.egov.usda.gov/references/public/MW/MD_Wildflower_Habitat_Establishment_Guide_January_2023.pdf. September 27, 2024. live.
  21. Web site: Chip. Taylor. March 29, 2024. Is the eastern monarch population continuing to decline?. Monarch Watch Blog. MonarchWatch.org. September 8, 2024. https://web.archive.org/web/20240716153838/https://monarchwatch.org/blog/2024/03/29/is-the-eastern-monarch-population-continuing-to-decline/. July 16, 2024. live.
  22. Multiple sources:
  23. Multiple sources:
  24. Multiple sources:
  25. Multiple sources:
    • Web site: Marc. Carlton. Helen. Bostock. Steve. Head. Plants for Pollinators. United Kingdom. Wildlife Gardening Forum. August 1, 2021. https://web.archive.org/web/20210730070026/http://www.wlgf.org/plants_pollinators.html. July 30, 2021. live. 'Double' or flora pleno flowers have been bred so that most, or all, of the reproductive parts of the flower have been converted into extra petals, so are useless for pollinators..
    • Web site: Justin. Wheeler. November 21, 2017. Picking Plants for Pollinators: The Cultivar Conundrum. Xerces Blog. The Xerces Society for Invertebrate Conservation. August 1, 2021. https://web.archive.org/web/20210414190853/https://xerces.org/blog/cultivar-conundrum. April 14, 2021. live.
    • Sarah. Corbet. Jennie. Bee. Kanchon. Dasmahapatra. Stephan. Gale. Elizabeth. Gorringe. Beverly. La Ferlaf. Tom. Moorhouse. Andrea. Trevail. Yfke. Van Bergen. Maria. Vorontsova. 3. February 2001. Native or Exotic? Double or Single? Evaluating Plants for Pollinator-friendly Gardens. Annals of Botany. 87. 2. 219–232. 10.1006/anbo.2000.1322. Oxford, England. Oxford University Press. 32050738. free.
    • Annie. White. From Nursery to Nature: Evaluating Native Herbaceous Flowering Plants Versus Native Cultivars for Pollinator Habitat Restoration. Graduate College Dissertations and Theses. 626. 97. 1032499444. Burlington, Vermont. University of Vermont. ScholarWorks@UVM. August 1, 2021. Double-flowers: Selecting for a double flower also comes at a cost for pollinators. The reproductive organs (stamens and carpels) in double-flowered varieties have been modified into additional petals, thus rendering the plant sterile or near sterile, and reducing the quantity and/or accessibility of floral rewards (Comba et al. 1999; Corbet et al. 2001)..
  26. Multiple sources:
    • Web site: Justin. Wheeler. November 21, 2017. Picking Plants for Pollinators: The Cultivar Conundrum. Xerces Blog. The Xerces Society for Invertebrate Conservation. August 1, 2021. https://web.archive.org/web/20210414190853/https://xerces.org/blog/cultivar-conundrum. April 14, 2021. live.
    • Web site: Vazquez. Claudio. 2021. Cultivars...Don't shoot the messenger!. Washington, D.C.. Izel Native Plants. October 14, 2024. https://web.archive.org/web/20240615052133/https://www.izelplants.com/blog/cultivars-dont-shoot-the-messenger/. June 15, 2024. live. The rule of thumb is that cultivars that significantly affect flower structure and/or color are the ones likely to alter their appeal to pollinators. ….. There is a strong indication that altering leaf color, and the chemical changes this implies, reduces a plant’s ability to serve as a resource for herbivorous insects..
  27. Web site: Ann. Young-Mathews. 2011. Plant fact sheet for orange eye butterflybush (Buddleja davidii). Corvallis, Oregon. United States Department of Agriculture

    Natural Resources Conservation Service: Corvallis Plant Materials Center

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  37. Lucci Freitas . André Victor . Agra Iserhard . Cristiano . Pereira Santos . Jessie . Oliveira CarreiraI . Junia Yasmin . Bandini Ribeiro . Danilo . Alves Melo . Douglas Henrique . Batista Rosa . Augusto Henrique . Marini-filho . Onildo João . Mattos Accacio . Gustavo . Uehara-prado . Marcio . Studies with butterfly bait traps: an overview . Revista Colombiana de Entomología . December 2014 . 40 . 2 . 203–212 .
  38. Book: Omkar. Ecofriendly Pest Management for Food Security. 322 . 3 February 2016. Academic Press. Google Books. 9780128032664.
  39. Web site: harvester butterfly – Feniseca tarquinius (Fabricius). entnemdept.ufl.edu. 2017-11-13.
  40. Web site: Monika. Maeckle. https://web.archive.org/web/20150407192327/http://texasbutterflyranch.com/2014/04/11/milkweed-shortage-sparks-alternative-fuels-for-hungry-monarch-caterpillars/. 2015-04-07. Milkweed Shortage Sparks 'Alternative Fuels' for Hungry Monarch Caterpillars. 2014-04-11. Texas Butterfly Ranch. 2015-06-01.
  41. Multiple sources:
    • 10.1155/2010/689301. Citizen Science Observations of Monarch Butterfly Overwintering in the Southern United States. . 2010 . 1 . 2010 . Howard . Elizabeth . Aschen. Harlen . Davis . Andrew K. . free.
    • 25589600. 4308991. 2015. Satterfield. D. A.. Loss of migratory behaviour increases infection risk for a butterfly host. . 282. 1801. 20141734. Maerz. J. C.. Altizer. S. 10.1098/rspb.2014.1734.
    • Exposure to Non-Native Tropical Milkweed Promotes Reproductive Development in Migratory Monarch Butterflies. Insects. 10. 8. 253. Ania A. . Majewska. Sonia. Altizer. 10.3390/insects10080253. August 16, 2019 . 6724006. 31426310. free.
  42. Web site: Monarch Watch. monarchwatch.org. September 27, 2015.
  43. Multiple sources:
  44. Web site: Taylor. David. Common Milkweed (Asclepias syriaca L.). Plant of the Week. December 24, 2023. https://web.archive.org/web/20230122001337/https://www.fs.usda.gov/wildflowers/plant-of-the-week/asclepias_syriaca.shtml. January 22, 2023. live. United States Department of Agriculture, United States Forest Service.
  45. Multiple sources:
    • Book: National Academies of Sciences, Engineering, and Medicine. National Academies of Sciences, Engineering, and Medicine. Evaluating the Suitability of Roadway Corridors for Use by Monarch Butterflies. 2020. 2020935714. 9780309481328. 1229163481. 10.17226/25693. 79–80. Washington, D.C.. National Academies Press. 218854539. National Cooperative Highway Research Program (NCHRP) Research Report 942. July 8, 2021. https://web.archive.org/web/20200729123529/http://www.trb.org/Publications/Blurbs/180186.aspx. July 29, 2020. live. Could roadside mowing stimulate milkweed growth and support monarch breeding? Limited research in eastern North America has shown that spring or summer mowing can promote new growth and extend the availability of milkweed plants for monarch breeding. Mowing may stimulate growth of some milkweed species, particularly those that spread through rhizomes like common milkweed (A. syriaca) and showy milkweed (A. speciosa). Summer (June or July) mowing in Michigan resulted in more monarch eggs on regenerated stems than unmowed stems. Summer (July) mowing and burning can increase green antelopehorn milkweed (A. viridis) availability in the late summer and early fall in the Southern Great Plains, whereas in areas without mowing, the milkweed has senesced by August. In the West, showy milkweed will regrow after summer mowing and continue to support monarch breeding (Stephanie McKnight, personal observation). However, more research is needed in other areas to determine the optimal timing and frequency of mowing that promotes not only milkweed but also nectar plants. It is also unknown if the benefit of additional milkweed availability in the fall outweighs the costs of the larval mortality caused by summer mowing. The benefits are likely greater in areas that primarily have breeding monarchs in the spring and fall and where the dominant species of milkweed spread by rhizomes. Sources: Alcock et al. 2016; Baum and Mueller, 2015; Bhowick 1994; Haan and Landis 2019; Fischer et al. 2015.
    • News: Adrian. Higgins. A gardener's guide to saving the monarch. Home & Garden. The Washington Post. 17 Oct 2020. 27 May 2015. https://web.archive.org/web/20150531181342/http://www.washingtonpost.com/lifestyle/home/creating-a-rest-stop-for-the-monarch/2015/05/26/cd81a75c-ffcb-11e4-805c-c3f407e5a9e9_story.html. 31 May 2015. live. 'The monarch doesn't care where the milkweed grows, and putting it in residential neighborhoods makes perfect sense,' said Doug Tallamy, an entomologist at the University of Delaware, author and expert on wildlife habitat gardens. ....
      The Smithsonian Institution's Butterfly Habitat Garden .... and the Ripley Garden .... are both good places to see milkweed integrated into a garden setting.
      At the butterfly garden, you can see the common milkweed ... now looking pretty good in fresh, unblemished clumps. By late summer, it looks tall, tired and tough. Tallamy says if you grow it, you should cut it back at least by half in June to produce soft foliage in late summer that will be more munchable for the caterpillars. If you do that, make sure there are no larvae on the plant before you chop it..
    • Web site: Abugattas. Alonzo. Monarch Way Stations. 5 July 2021. Capital Naturalist. 3 January 2017. https://web.archive.org/web/20210308084527/http://capitalnaturalist.blogspot.com/2017/01/monarch-way-stations.html. 8 March 2021. live. Blogger. Virginia is blessed for instance with 13 native Asclepias species plus 4 climbing vines that Monarch caterpillars can feed on. For the best results, cut the some of the stems back in late summer after they've bloomed. Fall is the when we get the most Monarchs laying eggs on our milkweeds. Since the mother butterflies prefer young, more tender growth, you can provide this by timing your pruning so there are new leaves by September or so for the arriving Monarchs. Just make sure to leave a few to produce pods for seeds. The local monarch favorite is Common Milkweed (A. syriaca), ..... .
    • Web site: Tony. Gomez. Asclepias syriaca: Common Milkweed for Monarch Caterpillars. Monarch Butterfly Garden. MonarchButterflyGarden.net. 17 October 2010. https://web.archive.org/web/20150316044421/http://monarchbutterflygarden.net/milkweed-plant-seed-resources/asclepias-syriaca/. 16 March 2015. live. Cut- At mid season after the blooms have faded, cut some common plants back by about a third. This promotes fresh plant growth and could get you an extra generation of monarchs on the fresh new leaves. Leave some plants uncut if you want to harvest milkweed seeds in fall..
    • Web site: Northeast Region Milkweed Species. Monarch Joint Venture. https://web.archive.org/web/20150521014203/http://monarchjointventure.org/images/uploads/documents/MilkweedFactSheetFINAL.pdf. May 21, 2015. live.
    • Web site: Michelle. Stevens. Plant guide for common milkweed (Asclepias syriaca). United States Department of Agriculture

      Natural Resources Conservation Service: National Plant Data Center

      . July 5, 2021. https://web.archive.org/web/20210705151637/https://plants.usda.gov/DocumentLibrary/plantguide/pdf/cs_assy.pdf. July 5, 2021. live.
  46. Multiple sources:
    • Web site: Borders. Brianna. Lee–Mäder. Eric. 2014. Milkweed Propagation and Seed Production: Stratification. Milkweeds: A Conservation Practitioner's Guide: Plant Ecology, Seed Production Methods, and Habitat Restoration Opportunities. 28–29. Portland, Oregon. The Xerces Society for Invertebrate Conservation. July 12, 2021. https://web.archive.org/web/20210704050023/https://www.fws.gov/southwest/es/Documents/R2ES/Pollinators/8-Milkweeds_Handbook_XerSoc_June2014.pdf. July 4, 2021. live.
    • Thomas D.. Landis. R. Kasten. Dumroese. Propagating Native Milkweeds for Restoring Monarch Butterfly Habitat. International Plant Propagators' Society, Combined Proceedings (2014). 2015. 64. 302. July 11, 2021. https://web.archive.org/web/20210308083021/https://www.fs.fed.us/rm/pubs_journals/2015/rmrs_2015_landis_t001.pdf. March 8, 2021. live. United States Department of Agriculture

      United States Forest Service

      . Many sources of milkweed seeds require stratification (cold, moist treatment) before sowing. In a review of stratification requirements for common milkweed, recommendations varied from as short as 7 days to as long as 11 months at 5°C (41°F) (Luna and Dumroese, 2013). Butterfly milkweed (A. tuberosa) germination increased from 29 to 48 to 62% as stratification duration increased from 0 to 30 to 60 days, respectively (Bir, 1986). Our informal natural stratification trial with showy (milkweed) and narrow leaf milkweed (A. fascicularis) in southern Oregon revealed that seeds began to germinate after 15 weeks in stratification (Fig. 3A)..
    • News: Adrian. Higgins. 7 milkweed varieties and where to find them. Home & Garden. The Washington Post. 27 May 2015. 17 October 2020. Seed may be stubborn to germinate and may need a period of cold treatment.. https://web.archive.org/web/20200926092547/https://www.washingtonpost.com/lifestyle/home/a-world-of-milkweeds/2015/05/26/43fba7d6-fe6c-11e4-833c-a2de05b6b2a4_story.html. 26 September 2020. live.
    • Web site: Tony. Gomez. Asclepias syriaca: Common Milkweed for Monarch Caterpillars. Monarch Butterfly Garden. MonarchButterflyGarden.net. October 17, 2010. https://web.archive.org/web/20150316044421/http://monarchbutterflygarden.net/milkweed-plant-seed-resources/asclepias-syriaca/. March 16, 2015. live. Start seeds indoors 2 months before final frost- seeds must be cold stratified..
    • Web site: Michelle. Stevens. Plant guide for common milkweed (Asclepias syriaca). United States Department of Agriculture

      Natural Resources Conservation Service: National Plant Data Center

      . July 5, 2021. https://web.archive.org/web/20210705151637/https://plants.usda.gov/DocumentLibrary/plantguide/pdf/cs_assy.pdf. July 5, 2021. live. If planting in flats or in a greenhouse, common milkweed seeds should be cold-treated for three months..
    • Web site: Asclepias syriaca. Butterfly gardening & all things milkweed. July 7, 2015. https://web.archive.org/web/20150707205734/https://sites.google.com/site/gardeningforbutterflies/asclepias-syriaca. 7 July 2015. live. germination: seed requires cold moist period..
  47. Multiple sources:
  48. Book: James. Bush-Brown. Louise. Bush-Brown. 1958. https://archive.org/details/americasgardenbo00bush_0/page/767/mode/1up. Chapter 32: Mulches. America's garden book. 768. 597041748. 58005738. Charles Scribner's Sons. New York. registration. Internet Archive.
  49. Parsons . J. A. . A digitalis-like toxin in the monarch butterfly, Danaus plexippus L . The Journal of Physiology . 1 May 1965 . 178 . 2 . 290–304 . 10.1113/jphysiol.1965.sp007628 . 14298120 . 1357291 .
  50. Web site: Butterfly Society of Virginia. 2019. Growing Milkweed. December 25, 2023. https://web.archive.org/web/20190624061425/https://www.butterflysocietyofva.org/Growing-Milkweed. June 24, 2019. I’ve grown butterfly weed, swamp milkweed, Asclepias currassavica (bloodflower), Asclepias syriaca (common milkweed), and Asclepias verticillata (whorled milkweed). I’ve found that butterfly weed is the least favorite of my Monarch guests in my Virginia Beach garden for laying eggs (perhaps the leaves are tougher?). live.
  51. Multiple sources:
    • Web site: John. Gunn. Milkweeds (mostly Asclepias spp.). Alonso Abugattas Shares Native Plant Picks for Wildlife. May 20, 2016. Mid-Atlantic Gardener (John Gunn). October 17, 2020. And if you have hot, dry conditions in your yard, try Butterflyweed (A. tuberosa). .... It's the least favored by Monarch caterpillars because it has very little toxin (cardiac glycosides) in its leaves.. https://web.archive.org/web/20201021024837/https://midatlanticgardener.com/alonso-abugattas-native-plant-wildlife/. October 21, 2020. dead.
    • Web site: Abugattas. Alonzo. Monarch Way Stations. 5 June 2017. Capital Naturalist. 3 January 2017. Blogger. (A. tuberosa) is the least favored by monarch caterpillars .... because it has very little toxin (cardiac glycosides) in its leaves, .... .. https://web.archive.org/web/20170605221624/http://capitalnaturalist.blogspot.com/2017/01/monarch-way-stations.html. 5 June 2017. live.
    • Victoria M.. Pocius. Diane M.. Debinski. John M.. Pleasants. Keith G.. Bidne. Richard L.. Hellmich. January 8, 2018. Monarch butterflies do not place all of their eggs in one basket: oviposition on nine Midwestern milkweed species. 10.1002/ecs2.2064. Ecosphere. 9. 1. 1–13. Ecological Society of America (ESA). In our study, the least preferred milkweed species A. tuberosa (no choice; Fig. 2) and A. verticillata (choice; Fig. 3A) both have low cardenolide levels recorded in the literature (Roeske et al. 1976, Agrawal et al. 2009, 2015, Rasmann and Agrawal 2011). free. 2018Ecosp...9E2064P .
    • Web site: Butterfly Weed: Asclepias tuberosa. Becker County, Minnesota. Becker Soil and Water Conservation District. September 11, 2020. Unlike other milkweeds, this plant has a clear sap, and the level of toxic cardiac glycosides is consistently low (although other toxic compounds may be present).. September 11, 2020. https://web.archive.org/web/20200911011945/https://www.co.becker.mn.us/dept/soil_water/PDFs/flowers_grasses/Butterfly%20Weed.pdf. live.
    • Mikkelsen . Lauge Hjorth . Hamoudi . Hassan . Gül . Cigdem Altuntas . Heegaard . Steffen . Corneal Toxicity Following Exposure to Asclepias Tuberosa . The Open Ophthalmology Journal . 31 January 2017 . 11 . 1 . 1–4 . 10.2174/1874364101711010001 . free. 28400886 . 5362972 .
    • Warashina . Tsutomu . Noro . Tadataka . 8,12;8,20-Diepoxy-8,14-secopregnane Glycosides from the Aerial Parts of Asclepias tuberosa . Chemical and Pharmaceutical Bulletin . 2010 . 58 . 2 . 172–179 . 10.1248/cpb.58.172 . 20118575 . free .
  52. Victoria M.. Pocius. Diane M.. Debinski. John M.. Pleasants. Keith G.. Bidne. Richard L.. Hellmich. January 8, 2018. Monarch butterflies do not place all of their eggs in one basket: oviposition on nine Midwestern milkweed species. 10.1002/ecs2.2064. Ecosphere. 9. 1. 1–13. Ecological Society of America (ESA). In our study, the least preferred milkweed species A. tuberosa (no choice; Fig. 2) and A. verticillata (choice; Fig. 3A) both have low cardenolide levels recorded in the literature (Roeske et al. 1976, Agrawal et al. 2009, 2015, Rasmann and Agrawal 2011). free. 2018Ecosp...9E2064P .
  53. Web site: Gomez. Tony. Asclepias tuberosa: Butterfly Weed for Monarchs and More. Monarch Butterfly Garden. MonarchButterflyGarden.net. 17 October 2010. Rough leaves for monarch caterpillars, not typically a heavily used host plant. https://web.archive.org/web/20160729233805/http://monarchbutterflygarden.net/milkweed-plant-seed-resources/asclepias-tuberosa-butterfly-weed/. July 29, 2016. live. .
  54. Victoria M.. Pocius. Diane M.. Debinski. John M.. Pleasants. Keith G.. Bidne. Richard L.. Hellmich. January 8, 2018. Monarch butterflies do not place all of their eggs in one basket: oviposition on nine Midwestern milkweed species. 10.1002/ecs2.2064. Ecosphere. 9. 1. 1–13. Ecological Society of America (ESA). free. 2018Ecosp...9E2064P . Additionally, A. tuberosa has a layer of trichomes, which may inhibit oviposition or decrease a female's ability to sense leaf chemicals..
  55. Victoria M.. Pocius. Diane M.. Debinski. John M.. Pleasants. Keith G.. Bidne. Richard L.. Hellmich. January 8, 2018. Monarch butterflies do not place all of their eggs in one basket: oviposition on nine Midwestern milkweed species. 10.1002/ecs2.2064. . 9. 1. 1–13. Ecological Society of America. 2018Ecosp...9E2064P. In no-choice tests, we saw the highest egg counts on Asclepias incarnata followed by Asclepias sullivantii and Asclepias syriaca (Fig. 2). In preference tests, over half of all eggs laid were on A. incarnata (Fig. 3).. free.
  56. Multiple sources:
  57. Web site: Abugattas. Alonzo. Monarch Way Stations. 5 July 2021. Capital Naturalist. 3 January 2017. https://web.archive.org/web/20210308084527/http://capitalnaturalist.blogspot.com/2017/01/monarch-way-stations.html. 8 March 2021. live. Blogger. A better option for most gardeners might be Swamp Milkweed (A. incarnata) which, despite its name, does fine in regular garden soil and doesn't spread by runners..
  58. Web site: Asclepias incarnata. Bring Back The Monarchs. Monarch Watch. July 5, 2021. https://web.archive.org/web/20210612021725/https://monarchwatch.org/bring-back-the-monarchs/milkweed/milkweed-profiles/asclepias-incarnata/. June 12, 2021. live. Life span: In gardens most plants live two-five years but known to survive up to 20 years. .... Propagation: Slow to spread via seeds. .... 'Overhead Conditions: Not shade tolerant. An early successional plant that tends to grow at the margins of wetlands and in seasonally flooded areas. It is not a good vegetative competitor and tends to disappear as vegetative density increases and habitats dry out..

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