Pruning phlox in the fall not only preps the plant for bigger blooms in the spring, it also prevents powdery mildew from forming and spreading.
Should You Prune Phlox In The Fall? What To Do Now For Bigger Blooms

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Pruning phlox in the fall not only preps the plant for bigger blooms in the spring, it also prevents powdery mildew from forming and spreading.