How-to Guide
When and How to Divide Perennials
The short answer
Divide most perennials when the clump gets crowded, dies out in the middle, or flowers less. The timing rule: divide spring- and early-summer bloomers in fall, and divide late-summer/fall bloomers in spring — so you're never cutting a plant apart right before it flowers.
Dig up the whole clump, split it into sections (by hand, with two forks back-to-back, or a spade/knife) making sure each piece has roots and shoots, then replant immediately at the same depth and water well.
When to divide
- Spring / early-summer bloomers → divide in early fall (give 4-6 weeks before the ground freezes to establish).
- Late-summer / fall bloomers → divide in spring, before hot weather.
- Signs it's time: a bare, dead center; smaller flowers; a clump outgrowing its space.
How to divide
- 1Dig the clump — Lift the whole rootball with a sharp spade.
- 2Split it — Pull apart by hand, pry with two forks back-to-back, or cut with a knife/spade — each division needs both roots and growing shoots.
- 3Replant right away — Set divisions at the same depth they grew, work some compost into the holes, and firm the soil.
- 4Water in — Water well and keep evenly moist while they re-establish.
✔ Divide on a cool, overcast day and get divisions back in the ground fast so the roots don't dry out.
Sources
Reviewed 2026-07-18. We cite university Extension, government, and established horticultural sources — and never invent pesticide rates or dangerous treatments.
- University of Minnesota Extension — How and when to divide perennials — Divide perennials when clumps are overgrown or die out in the center; generally divide spring bloomers in fall and fall bloomers in spring, replanting divisions promptly at the same depth.
- Clemson Cooperative Extension (HGIC) — Dividing Perennials — Divide spring- and summer-flowering perennials in fall and fall-flowering ones in spring; fall divisions need at least 4-6 weeks before the ground freezes to establish.