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Asters prefer areas with cool, moist summers, as well as cool nights, in sites with full to partial sun. In warmer climates, they do not like the hot midday sun.
Asters enliven the garden in late summer and autumn, providing valuable late-season nectar for bees and butterflies. These upright plants grow 1 to 6 feet tall and their star-shaped flower heads range from purple to white to blue.