Divide most perennial flowers now. Many perennials should be divided every three or four years. Plants need to be divided when they start to have fewer blooms each year, develop a dead spot in the middle of the clump of stems, or otherwise seem crowded. To divide, dig up the entire plant. Break the roots into several clumps with your hands or a spading fork. Replant the clumps, leaving twelve to eighteen inches between them.
Veronica Lorson Fowler with the Federated Garden Clubs of Iowa, Gardening in Iowa and Surrounding Areas
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