Pruning English Lavender
When and how — Lavandula angustifolia 'Hidcote'
Prune your english Lavender in August, September and March — the optimal month is usually September.
The next pruning window is August.
When to prune?
The perennial english Lavender is pruned in August, September and March.
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 english Lavender
Lavandula angustifolia 'Hidcote' needs pruning twice a year to maintain its compact shape and encourage vigorous flowering. Without regular pruning, plants become woody, bare at the base, and produce fewer blooms. The first prune comes in August or September, immediately after flowering finishes. Use clean, sharp secateurs or garden shears to cut back the spent flower stems along with about 2–3 cm of the soft green growth beneath them. This deadheading prevents the plant wasting energy on seed production and keeps it tidy through autumn. Don't cut into the old brown wood at this stage—just trim the leafy green growth. The main structural prune happens in March, as new growth begins to emerge at the base. Cut back all the previous year's growth by about one-third to one-half, shaping the plant into a neat dome. Again, avoid cutting into thick, bare, woody stems, as lavender rarely regenerates from old wood. If you can see fresh green shoots lower down, you can prune just above them. This spring trim stimulates bushy new growth and plenty of flower buds for summer. If your 'Hidcote' has become very woody and gappy, it's usually better to replace it than attempt hard renovation pruning. Young plants are inexpensive and establish quickly. Always prune on a dry day to reduce the risk of fungal infection entering cut stems.
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.
Hold off on pruning
Better to wait than prune at the wrong moment. The next optimal window is August. Until then: leave the plant alone — only remove dead or diseased wood (which you can do year-round).
