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Aster

Single, sky-blue flowers with bright yellow centers, late summer to October. Waxy medium green foliage. Asters prefer moist, rich soil. Divide every 2–3 years in spring or fall. To avoid powdery mildew, maintain good air circulation by proper spacing and, if necessary, staking. Water from below. A fungicide may be used in early July. Attracts butterflies. Spacing: 18–24".