How to Divide Perennials
Owen Petrakis · Oct 19, 2026 · 5 min read
Quick answer
Dividing overgrown clumps refreshes plants and gives you free new ones.
Many perennials grow into large clumps that flower less in the middle over time.
Dividing them every few years keeps them vigorous.
1 When to divide
Most perennials are divided in spring or autumn when the soil is moist and warm. Avoid hot, dry weather.
2 How to divide
- ✓Dig up the whole clump
- ✓Split with two forks back to back, a spade, or a knife
- ✓Discard the woody centre
- ✓Replant healthy outer sections
- ✓Water well
3 Good candidates
Hostas, daylilies, asters, geraniums, and ornamental grasses divide easily.
4 Plants that dislike division
Some perennials such as peonies and hellebores resent disturbance and are best left alone.
5 Aftercare
Water divisions regularly until they establish, especially in dry spells. Cut back tall foliage on divisions to reduce water loss. Spare divisions can be potted up and given to friends or swapped at plant sales. Many divisions flower lightly the first year and fully the next.
This is general gardening information. Results depend on your climate, soil, and conditions. Follow label directions for any fertiliser or treatment, and check whether plants are toxic to pets or children before bringing them home.