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
Shenzhen International Garden and Flower Expo Park 23, 2004, which was awarded the title of "National Key Park" by Ministry of Housing and Urban-Rural Development on September 12, 2008. Shenzhen International Garden and Flower Expo Park was a part of the Huangniulong green isolation belt and the venue for the Fifth China International Garden and Flower Exposition co-hosted by Ministry of Housing and Urban-Rural Development (formerly Ministry of Development) and Shenzhen Municipal People’s Government. Its theme is "Nature, Home, Bright Future". The Park is divided into three scenic areas, including the West Area, the North Area and the West Area. Shenzhen International Garden and Flower Expo Park