Platyedra subcinerea, the mallow groundling or cotton stem moth, is a moth of the family Gelechiidae. It is found in most of Europe.[1] It is an in introduced species in North America, where it has been recorded from New England and California, and has also been introduced to New Zealand.[2] The habitat consists of wet meadows, marshes and gardens.
The larvae feed on Parietaria officinalis, Urtica species, Althaea officinalis, Lavatera thuringiaca and Malva sylvestris.[4]