Crocosmia Explained

Crocosmia, also known as montbretia[1], is a small genus of flowering plants in the iris family, Iridaceae. It is native to the grasslands of southern and eastern Africa, ranging from South Africa to Sudan. One species is endemic to Madagascar.[2]

Description

They can be evergreen or deciduous perennials that grow from basal underground corms. The alternate leaves are cauline and ensiform (sword shaped). The blades are parallel-veined. The margin is entire. The corms form in vertical chains with the youngest at the top and oldest and largest buried most deeply in the soil. The roots of the lowermost corm in a chain are contractile roots and drag the corm deeper into the ground where conditions allow. The chains of corms are fragile and easily separated, a quality that has enabled some species to become invasive and difficult to control in the garden.

They have colourful inflorescences of 4 to 20 vivid red and orange subopposite flowers on a divaricately (horizontally) branched stem. The terminal inflorescence can have the form of a cyme or a raceme. These flower from early summer well into fall. The flowers are sessile on a flexuose arched spike. The fertile flowers are hermaphroditic. All stamens have an equal length. The style branches are apically forked. They are pollinated by insects, birds (sunbirds) or by the wind. The dehiscent capsules are shorter than they are wide.

The genus name is derived from the Greek words krokos, meaning "saffron", and osme, meaning "odor" – from the dried leaves emitting a strong smell like that of saffron (a spice derived from Crocus – another genus belonging to the Iridaceae) – when immersed in hot water.[3]

The alternative name montbretia is still widely used, especially for the garden hybrid C. × crocosmiiflora.[4] "Montbretia" commonly used in the British Isles for orange-flowered C. × crocosmiiflora cultivars that have naturalised, while "crocosmia" is reserved for less aggressive red-flowered cultivars. Montebretia is a heterotypic synonym of the genus Tritonia in which some species of Crocosmia were once included. It was named by Alire Raffeneau Delile for, a fellow French botanist on Napoleon's Egyptian Campaign.[5]

Species

Species accepted by World Checklist of Selected Plant Families:[2]

Garden hybrids

Cultivation

Crocosmias are grown worldwide, and more than 400 cultivars have been produced. Some hybrids have become invasive, especially C. × crocosmiiflora hybrids, which are invasive in the UK,[7] Ireland,[8] Australia,[9] New Zealand,[10] [11] [12] North Carolina,[13] and the West Coast of the United States.[14] [15]

Crocosmia are winter-hardy in temperate regions. They can be propagated through division, removing offsets from the corm in spring.

The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit:

External links

Notes and References

  1. Book: RHS A-Z encyclopedia of garden plants. 2008. Dorling Kindersley. United Kingdom. 978-1405332965. 1136.
  2. Web site: Crocosmia Planch. Kew World Checklist of Selected Plant Families.
  3. Book: Manning. John . Goldblatt. Peter . Peter Goldblatt. The Iris Family: Natural History & Classification . Timber Press . Portland, Oregon. 144–47 . 2008. 978-0-88192-897-6.
  4. https://www.gardenersworld.com/how-to/grow-plants/how-to-grow-crocosmias/ "How to Grow Crocosmias."
  5. Diana Wells. 100 Flowers and How They Got Their Names. Algonquin Books, 1997. pp. 142-143.
  6. http://www.missouribotanicalgarden.org/gardens-gardening/your-garden/plant-finder/plant-details/kc/h680/crocosmia-lucifer.aspx Missouri Botanical Gardens
  7. https://www.plantlife.org.uk/uk/discover-wild-plants-nature/plant-fungi-species/montbretia Montbretia
  8. https://www.irishexaminer.com/property/homeandgardens/arid-20456298.html Wildly beautiful but caution should be taken with invasive plants
  9. http://keyserver.lucidcentral.org/weeds/data/media/Html/index.htm Weeds of Australia
  10. http://www.wildflowers-and-weeds.com/Plant_Identification/New_Zealand/Introduced_Weeds.htm Common Weeds of New Zealand: Introduced and Invasive Species
  11. https://www.cabi.org/isc/datasheet/55282 Crocosmia x crocosmiiflora (montbretia)
  12. http://www.weedbusters.org.nz/weed-information/weed-list/ Weeds of New Zealand
  13. https://plants.ces.ncsu.edu/plants/crocosmia-x-crocosmiiflora/ Crocosmia x crocosmiiflora
  14. https://www.invasive.org/browse/subinfo.cfm?sub=18731 Crocosmia x crocosmiiflora
  15. https://www.cal-ipc.org/plants/profile/crocosmia-x-crocosmiiflora-profile/ Crocosmia x crocosmiiflora
  16. Web site: Crocosmia 'Hellfire' . RHS . 5 May 2020.
  17. Web site: RHS Plant Selector - Crocosmia 'Lucifer'. 15 April 2020.
  18. Web site: RHS Plant Selector - Crocosmia masoniorum. 15 April 2020.
  19. Web site: Crocosmia 'Paul's Best Yellow' . RHS . 5 May 2020.
  20. Web site: RHS Plant Selector - Crocosmia 'Severn Sunrise'. 15 April 2020.
  21. Web site: Crocosmia × crocosmiiflora 'Babylon' . RHS . 5 May 2020.
  22. Web site: RHS Plant Selector - Crocosmia × crocosmiiflora 'Star of the East' '. RHS . 5 May 2020.

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