How, when and why to divide garden perennials for better blooming

Gardeners are advised to divide perennials that are overgrowing, blooming less, or producing smaller flowers to improve plant health and sunlight access.
If your spring and early-summer perennials are overgrowing their spaces, blooming less, producing smaller flowers or flopping over (possibly with a hole in their centers), they’re telling you they want to be divided. Crowded plants often struggle because they must compete for limited water, nutrients and sunlight, and the diminished airflow between them also increases...
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