Pruning Daylily
When and how — Hemerocallis 'Stella de Oro'
Prune your daylily in March and November — the optimal month is usually November.
The next pruning window is November.
When to prune?
The perennial daylily is pruned in March and November.
With perennials, pruning is really seasonal management.
You don't prune perennials the way you prune shrubs. The work happens at three moments: (1) deadheading spent flower stems during the season to encourage repeat bloom, (2) optionally cutting back to about 10–15 cm above ground in late autumn, and (3) clearing all the old foliage in March before the new shoots emerge. Many gardeners now deliberately leave the old growth standing through winter — it protects the crown and shelters overwintering insects. Which approach to choose depends on taste and species: evergreen perennials (hellebore, bergenia) look better left alone, while wet-rotting species (hosta) need to come down after the first frost.
How to prune daylily
Daylilies don't require traditional pruning in the way shrubs do, but regular tidying keeps them looking good and encourages continuous flowering. Each flower lasts only one day—hence the common name—so remove spent blooms daily or every few days during the flowering season, which for 'Stella de Oro' runs from early summer through to late summer. Snap or snip off the faded flower just behind the bloom; this prevents seed formation and redirects energy into producing more buds. When an entire flower stem (scape) has finished blooming, cut it back to the base of the clump with secateurs. In November, once flowering has completely finished and foliage begins to yellow and collapse, cut back all leaves to around 10–15 cm above ground level. Use clean, sharp secateurs or shears. This autumn tidy-up removes tatty growth, reduces hiding places for slugs and snails over winter, and makes spring emergence tidier. Alternatively, if you prefer, leave the foliage until March and cut it back just as new growth begins to push through; this provides a little extra winter protection for the crown, though it's rarely necessary given daylilies' exceptional hardiness (zone 3a–9b). In March, remove any remaining dead foliage if you didn't cut back in autumn, and clear away old mulch or debris from around the crown. This is also the time to divide congested clumps every three to five years: lift the whole plant, tease or slice apart the fleshy roots, and replant healthy divisions with three to five fans of leaves each.
Common mistakes
✗ Cutting back too early in spring
Late frost can still strike and the old foliage protects the crown. Wait until the first new shoots are visible (usually mid-March) — then you know the season has actually started.
✗ Skipping deadheading
Hardy geranium, salvia, lupin and delphinium will give a second flush if you cut spent stems back to just above a pair of healthy leaves as soon as the first flowers fade.
✗ Cutting ornamental grasses down in autumn
The dry stems are the whole point of winter interest, AND they protect the crown from frost and waterlogging. Cut down to a fist's height only in late February.
Combine with feeding
In March you can combine pruning with feeding — efficient, and you only disturb the plant once. Read the full care guide for daylily →
Hold off on pruning
Better to wait than prune at the wrong moment. The next optimal window is November. Until then: leave the plant alone — only remove dead or diseased wood (which you can do year-round).
