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
Swiftia rosea Swiftia rosea Swiftia rosea is a species of gorgonian-type octocoral in the family Plexauridae. Colonies of this sea fan are usually high. There is usually a single main stem with a few branches at an angle to the main stem but in a single plane. The polyps are in two rows on the thicker branches but near the tips they are closer together and more disordered. The colour of this sea fan is dark red. The polyps are colourless and cannot be retracted back into the branches. This sea fan resembles the closely related but rather less common "Swiftia pallida",