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
Northwest Flower and Garden Show three stages, including a do-it-yourself demo stage. The show's 75–80 seminar speakers include garden writers and garden design experts from around the US, Canada, and UK. The show also has a City Living gardening demonstration, a balcony garden exhibition, the Vintage Garden Market, the Gourmet Marketplace, Ikebana displays, and a floral competition. There is a live reality show held daily in front of show audiences which have friendly competitions. Container Wars challenges two designers to create three lush planted containers in under an hour. The 2019 Northwest Flower & Garden Show dates are February 20 to 24. The show was