Rugged and beautiful, these shade lovers throw long and colorful spikes above divided foliage in summer, when color in the shade garden is hard to come by. Use them in groups in the woodland border, or mass them for ground cover. Bloom varies by variety from mid-June to the end of August; with careful selection, the display can be sustained through most of summer. In evenly moist or wet soil, Astilbes are tough, pest-free, and handsome. The only thing they cannot endure is drought.