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Asters should be cut back in late fall or early spring, after the first frost has killed the foliage but before new growth begins. This helps prevent disease and encourages healthy growth in the spring. If you're looking for a tidier appearance or to control their spread, cutting them back by about one-third can be done in early summer. Always ensure to remove any dead or damaged stems throughout the growing season.

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AnswerBot

2w ago

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