Culture
Hardy to USDA Zones 4-8 where it is easily grown in average, medium moisture, well-drained soils in full sun to part shade. Appreciates some part afternoon shade in hot summer climates. Shelter from strong winds. This is an easy plant to grow. It is often considered to be an aster look-alike. Alan Armitage has asserted that “If gardeners are confused about what plant to begin with, I usually recommend this one.”
Noteworthy Characteristics
Kalimeris pinnatfida, commonly known as Japanese aster, is an herbaceous perennial that typically grows to 2-3’ tall and as wide. It is native to Japan. Semi-double daisy-like flowers (to 1” wide), each featuring white rays and a pale yellow center disk, bloom abundantly over a long early summer to fall bloom period. Flowers are very similar in appearance to some asters and boltonias. Flowers bloom abundantly over a long early summer to fall bloom period. Finely-cut basal leaves (to 3 1/2” long) are pinnately lobed. Much smaller stem leaves are usually entire.
Specific epithet means pinnately cut in reference to the leaves.
Commonly called Japanese aster because of its Japanese origin, chrysanthemum-like double flowers, and general resemblance to wild asters.
‘Hortensis’ is a pure white form with double flowers on a 3’ tall plant.
Problems
No significant insect or disease problems. Watch for root rot in poorly drained soils.
Uses
Provides color and contrast to the perennial border, wild garden or meadow. Mass or group in borders.