Astilbe is a genus of 18 species of rhizomatous flowering plants, within the family Saxifragaceae, native to mountain ravines and woodland in Asia and North America.] Some species are commonly known as false goat's beard and false spirea. These hardy herbaceous perennials are cultivated by gardeners for their large, handsome, often fern-like foliage, and dense, feathery plumes of flowers. They are widely adapted to shade and water-logged conditions, hence they are particularly associated with pond-side planting. They also tolerate clay soils well. Numerous hybrid cultivars have been raised. Flowers of at least some astilbe species have a strong and pleasant aroma.