Some 18 species make up the astilbe segment of the Saxifragaceae family, some of which are known as false spirea or false goat's beard. Astilbe plants can grow in many climates and soil conditions, though they are most common in Asia and North America. They can bloom as early as June or as late as September. This quality, in particular, makes them popular in the Conservatory Garden. You can enjoy the beauty of the astilbe plant in Central Park throughout the gardening season. These plants are visually distinctive because their large leaves resemble ferns, while the flowering portions are full of dense blooms. Astilbe colors range from deep fuchsia to red to white.