Astilbe arendsii is a hybrid group developed by George Arends, typically blooming from late spring to early summer with tall, feathery plumes. It is well-adapted to shade gardens. Astilbe chinensis blooms later than most astilbes, often in mid to late summer, and is more drought-tolerant than other species, featuring dense, upright flower spikes. Astilbe japonica is one of the earliest blooming types, producing flowers in early to mid-summer, thriving in moist, well-drained soil with finely textured foliage. Astilbe simplicifolia is a more compact species with delicate, arching flower plumes and simple leaves instead of compound foliage.