Dahlia 'Kaiser Wilhelm' Dahlia 'Kaiser Wilhelm' Photo/Illustration: Scott Kunst 1 2 3 4 5 6 7 8 9 10 11 (Dahlia 'Kaiser Wilhelm') DAL-ee-ah Genus: Dahlia Of the maybe 10,000 named dahlias introduced in the 1800s—when dahlias ranked right up there with roses in popularity—only three survive. One of them is 'Kaiser Wilhelm', introduced in 1892. Its 3-inch flowers have neatly curled petals of soft custard-yellow brushed with burgundy, and a green button eye just like that of an old rose. The plant can grow to 5 feet. Noteworthy Characteristics: This is a tall heirloom dahlia. Care: Plant in well-drained, humus-rich soil in full sun. Fertilize weekly during growth. May need staking. Pinch, remove brandhes and buds, and deadhead to produce a lengthier flower display. Lift tubers in fall and store in a well-ventilated, frost-free location. Dahlias thrive in cool, moist climates. Propagation: Take basal shoot cuttings and root under plastic or a mist tent, with bottom heat, or divide clumps into two or more pieces, each with a shoot, and plant out after frost has passed. Problems: Aphids, stem borers, spider mites, caterpillars, earwigs, cucumber beetles, capsid bugs, flower thrips, planthoppers, slugs. Powdery mildew, impatiens necrotic spot, dahlia mosaic viruses, smut, fungal leaf spots, soft rot, crown gall, blossom blights (especially gray mold), and tomato spotted wilt virus. Overview Height 3 ft. to 6 ft. Spread 1 ft. to 3 ft. Growth Habit Clumps Growth Pace Moderate Grower Light Full Sun Only Moisture Medium Moisture Maintenance High Characteristics Attracts Butterflies, Showy Flowers Bloom Time Early Fall, Fall, Late Summer, Summer Flower Color Greenery, Red, Primrose Yellow Uses Beds and Borders, Container, Cut Flower Style Formal Garden Seasonal Interest Summer Interest Type Perennials Dahlia 'Kaiser Wilhelm'View the discussion thread.