Alcea "Alcea" species are used as food plants by the larvae of some Lepidoptera species including "Bucculatrix quadrigemina" and "Vanessa cardui", the painted lady. The mallow flea beetle ("Podagrica fuscicornis") is a pest that makes tiny holes in the leaves. Cutworms, aphids, and capsid bugs use the plant as a food source in hotter and drier conditions. A number of weevils use "A. rosea" as their host plant, including "Rhopalapion longirostre", "Alocentron curvirostre", and "Aspidapion validum". The plants are also susceptible to the pathogenic fungus "Puccinia malvacearum", the hollyhock rust. A hollyhock flower, known in Japan as , was incorporated into
Cylindropuntia rosea Cylindropuntia rosea Cylindropuntia rosea, the Hudson pear, is a cactus Australian botanists attribute to being native to the Sonoran Desert in Arizona and Northwestern Mexico. The plant is an invasive species in Australia. "Cylindropuntia rosea", the Hudson pear, has pink flowers and white spines. It has long, white, strong spines and can grow up to 1.5 metres high and 3m wide. It is very similar to "Cylindropuntia tunicata" which also grows in the same region and has yellow and straw coloured flowers. Hudson pear is an intentionally introduced species to Australia, where it has become an invasive species and noxious