Acorus gramineus 'Ogon' (Golden dwarf sweet flag, Japanese rush, Grassy-leaved sweet flag)

This perennial species is one of the most delicate of Thalictrums, with tiny foliage reminiscent of maidenhair ferns. It bears small, nodding, long-lasting flowers of a unique yellowish plum-brown. It grows to about 3 feet tall and wide.

The leaves of this clump-forming variety look as if they have been dusted by a fine mist of pink, cream, and green. It is a rebloomer, and in spring it  produces a profusion of fragrant light pink flowers on spires that can reach 15 inches, rising above the foliage which grows to about 6 inches tall and wide.

This clump-forming variety has very dramatic, deeply cut foliage with wide black veins that looks like a black snowflake when new. The dark color is more pronounced in cool weather. Plants produce a profusion of starry white flowers on numerous spires up to 12 inches high and grow to about a foot wide. Tiarellas are at home in moist woodland environments. In the garden they make wonderful carpets of intricate leaves. For a long period from spring into summer, the profusion of foamy flowers can be appreciated up close or from a distance. Grow 'Black Snowflake' as a groundcover or edger in a shady border or woodland garden. It is a great foil to early spring bulbs.

This reblooming, clump-forming variety blooms in spring, producing 15-inch spires densely packed with pink blossoms. Its deeply cut foliage is compact, with black markings along the midrib. Plants grow to about 10 inches tall and wide.