These perennials resemble astilbe, with slowly spreading clumps of finely divided leaves topped in summer by branching plumes of tiny white or cream flowers. Good in perennial borders or at edge of woodland. Needs moist, rich soil. Slow to establish. Deer resistant.
A. aethusifolius. Zones US, MS; USDA 6-7. Native to Korea. Deep green, finely divided leaves make a mound about 1 ft. tall and wide. White flower plumes reach 16 in. high. Useful in rock garden, as edging, for small-scale ground cover.
A. dioicus (A. sylvestris). Zones US, MS, LS; USDA 6-8. Native to the mountainous south. Grows to 6-7 ft. tall, 4 ft. wide, with foamy plumes of white flowers in 20-in., much-branched clusters. 'Kneiffii' is half the size of the species, with more finely divided leaves. 'Child of Two Worlds' ('Zweiweltenkind') grows to 5 ft. tall, with gracefully drooping flower clusters. 'Misty Lace' grows 1 ft. tall and 2 ft. wide and has greater heat tolerance and late spring flowers.