Hollyhock Alcea rosea Photo/Illustration: Michelle Gervais 1 2 3 4 5 6 7 8 9 10 11 Hollyhock (Alcea rosea) al-SEE-ah ROSE-ee-ah Synonyms: Althaea rosea Genus: Alcea This tall, upright perennial has single flowers of various colors that grow along a spike. It blooms in early summer and midsummer. Care: Provide full sun and average to dry soil. Propagation: Timing to sow seeds varies if grown as annual, biennial or perennial. Problems: Rust, leaf spots, southern blights, cutworms, slugs, mallow flea and Japanese beetles, and capsid bugs. Overview Height 6 ft. to 10 ft. Spread 1 ft. to 3 ft. Growth Habit Clumps Growth Pace Moderate Grower Light Full Sun Only Moisture Dry to Medium Maintenance Moderate Characteristics Self Seeds, Showy Seed Heads Bloom Time Early Summer, Summer Flower Color Pink, Red, White, Yellow Uses Beds and Borders, Container Style Cottage Garden Seasonal Interest Spring Interest Type Perennials Alcea roseaView the discussion thread.