Plant Division: When, Why, and How to Divide Perennials and Bulbs

Division — splitting a clump into multiple plants — rejuvenates crowded perennials, multiplies your stock, and costs nothing. Only for clump-formers with crowns (not taproots). Here's the playbook.

When to Divide

• Frequency: Every 3–5 years, or when crowded, flowering declines, center dies out.
• Timing: Spring or fall. General rule: spring bloomers → divide in fall; summer/fall bloomers → divide in spring. Daylilies: anytime.
• Dormant division: Best for plants that hate root disturbance (peony, bleeding heart).

How to Divide

1. Dig up entire clump (wide berth).
2. Shake off soil; inspect crown/roots.
3. Separate into sections (hands for bulbs; knife/spade for tough crowns). Each needs roots + shoots.
4. Trim dead material; optionally cut foliage back by half to reduce shock.
5. Replant immediately at same depth; water well; mulch.

Top Candidates

Hostas, daylilies, irises, ornamental grasses, coneflowers, black-eyed Susans, sedum, asters, bulbs (daffodils, tulips), peonies (carefully), ferns.

Division is plant multiplication at its easiest — and the plants thank you for it.