Dividing Perennials

Propagation

Dividing perennials is a quick way to make extra plants while restoring vigour to congested clumps. It suits many herbaceous plants that spread from crowns or fibrous root systems. Fresh divisions establish best when given moist soil, space and a little aftercare, producing stronger flowering and healthier growth in following seasons.

How to do it

Water the plant the day before if soil is dry. Lift the whole clump with a fork, starting well beyond the crown to preserve as many roots as possible. Shake or tease away enough soil to see natural divisions. Pull smaller clumps apart by hand, or use two forks back to back for tougher roots. Cut large crowns with a clean spade or knife, ensuring every division has healthy roots and several shoots or buds. Discard old, woody or diseased central sections. Replant divisions immediately at their original depth in prepared, moist soil, firm them in and water thoroughly. Keep them watered during dry weather until new growth shows they have settled.

When to do it

Divide most summer-flowering perennials in early autumn while soil remains warm, or in early spring as growth begins. Divide spring-flowering plants after flowering, if needed. Avoid dividing during drought, frozen ground or very hot weather. In colder areas, spring division can be safer for plants that need time to establish before winter.

Tips

Do not divide every perennial on a schedule; act when a clump has a bare centre, weaker flowering or has simply outgrown its place. Replant promptly so roots do not dry out. Share surplus divisions with a neighbour or grow them on in pots. Keep newly divided plants shaded briefly if weather turns unexpectedly warm.

Dividing Perennials: frequently asked questions

How does dividing perennials work?

Water the plant the day before if soil is dry.

When should I do dividing perennials?

Divide most summer-flowering perennials in early autumn while soil remains warm, or in early spring as growth begins.

What are some tips for dividing perennials?

Do not divide every perennial on a schedule; act when a clump has a bare centre, weaker flowering or has simply outgrown its place.

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General guidance for UK gardens. Page updated 18 Sep 2026.