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How and when should I divide my herbaceous perennials?

Divide when plants become overcrowded, bloom size begins to diminish or plants lose their vigor. Most perennials can be divided every 3–5 years. 

  • Divide late summer and fall-blooming varieties in spring, and spring-blooming varieties in fall. 
  • When plants are dormant in spring or fall, dig clumps from the ground and with a sharp knife or spade, cut into good sized divisions, each with several growing points and plenty of roots. 
  • Remove any dead or unhealthy plant parts and cut back stems. 
  • Replant one division where the plant was originally and plant the extra divisions elsewhere in your garden or give them away to gardening friends. 
  • Plant the divisions immediately, or as soon as possible, and water well.

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