Asters are invaluable in the hardy border, adding superb color in the autumn. Very durable and long lived. Even heavy, wet soils will suit them. Richer soils will generally yield taller plants. Mounds of color begin in September, in a full range of colors.
Pinch back and divide like mums for best display. General rule of thumb is to pinch until 4th of July and not after. Pinching yields better branching and more flowers. Can be divided every 2-3 years in spring. Avoid wet overwintering conditions.