A popular shade perennial, astilbes add color, movement and texture to shade and woodland gardens with their colorful flower plumes during the summer months. Its fernlike foliage also provides months of interest. Available in white, pink and red flower colors, astilbe is a deer-resistant perennial and a good companion plant for hostas. Most astilbes grow in zones 4-8 and in partial shade to full shade. When selecting astilbe plants to buy online, take into account the variety's mature height and spread. Astilbe looks best when planted in groups or massed. Astilbe can be planted in the spring or fall.