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Dividing clump-forming perennials like Chrysanthemums and asters is the best way to gain additional plants while preventing the problems that come with tightly clustered plants, namely stunted growth, pest infestation, and fungal disease. The process entails digging up the clump of the perennial, lifting it from the dirt, separating the crowns where the stem and root meet, then replanting the plant divisions in the dirt. Tackle this project between spring and fall, when the plant isn't flowering, to maintain a healthy garden.
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