An underused group of flowering perennials from eastern Asia. Easy to grow and colorful over a long season from summer into fall. Flowers resemble asters. Thrive in heat and humidity. Shear to encourage rebloom.
K. incisa. JAPANESE ASTER. Mound-forming perennial 1112 ft. high and about as wide. Light blue, daisylike flowers with yellow centers are 1 in. across. Oblong, bright green leaves are 34 in. long. 'Blue Star' has brighter blue petals. 'Edo Murasaki' has darker purple petals.
K. integrifolia 'Daisy Mae'. Clear white, 1-in. blooms with greenish yellow centers. Grows 2 ft. high and wide.
K. pinnatifida. FALSE ASTER. Perennial similar to Boltonia asteroides. White, 1-in. flowers resembling small chrysanthemums are borne by the hundreds all summer, forming a cloud over the foliage. Blossoms may be tinged pink or blue, have creamy yellow centers. The oval, pointed leaves are rich green. A basal rosette is formed by 3-in.-long leaves that are heavily serrated. Leaves on upper stems are only 1 in. long and usually have smooth edges. Grows to 24ft. tall, 2 ft. wide; spreads slowly.