Best in 6+ hours of sunlight.  Asters are an easy-to-grow perennial that grow well in average soils, but prefer moist well-drained soil in full sun. They will tolerate light shading. They grow approximately 20” in height. These lovely plants form broad bushy clumps, so they should be planted 18-24” apart. Mature clumps should be divided every 3-4 years in the early spring or late fall, once flowering has finished. For great results, pinch back the top 6-8” at least once during the summer, prior to mid-July, to create a bushier plant and to prolong the fall bloom. A common problem with asters is that they oftentimes acquire a powdery mildew. To prevent this, plant your asters in a sunny spot with good air circulation.