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How to Deadhead Lavender and When to Prune Harder

Deadheading after flowering keeps lavender tidy; the real work is the annual trim by a third into green growth. Never cut into bare wood.

By Salma 2 min read Save to Pinterest — opens Pinterest in a new tab
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Photo: CarlottaSilvestrini, Pixabay Content License, via Pixabay
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Deadheading is the easy half. The half that decides whether a lavender lasts a decade is the annual trim by a third, always into green growth.

Deadheading, step by step

  1. Wait for the flush to finish — most spikes faded
  2. Snip each stem to just above the first pair of leaves below it, or
  3. Shear the whole dome over in one pass with hedging shears, taking the stems and about an inch of leafy growth
  4. Keep the shape rounded, slightly wider at the base than the top
  5. Clear the debris from the crown, where it holds moisture

The annual trim

whenwhat
Straight after floweringRemove a third of the plant, into green growth, shaping the dome
Early springLight tidy only — winter damage, broken stems
AutumnNothing. Soft regrowth going into winter kills plants

The one rule that matters

Lavender has almost no dormant buds in old wood. A cut below the green growth does not produce new shoots — the stem dies back, and whatever was above it dies with it. Always leave green leaves on every stem you cut.

Rescuing an overgrown plant

  • Green shoots low on the stems? Reduce by a third each year after flowering, over two or three years
  • Bare grey base, leaves only at the tips? It will not regenerate. Take cuttings in summer and replace the plant
  • Split and sprawling? Pegging a branch down to root as a layer gives you a replacement for nothing
  • Expect 8–12 years from a lavender. Trimming annually from year one is what reaches that

Harvesting for drying

  • Stage: about a third of the flowers on a spike open, the rest in bud
  • Time: a dry morning once the dew has gone
  • Cut long stems, bundle around twenty, band loosely
  • Hang upside down somewhere dark, dry and airy for two to four weeks
  • This counts as the trim — shape the plant afterwards if it needs it

Common questions

How do you deadhead lavender?

Cut each spent flower stem back to just above the first pair of leaves on the green growth below it, using snips or shears. On an established plant it is faster to shear the whole top over, taking the flower stems and about an inch of leafy growth in one pass, which also keeps the dome shape. Deadheading often prompts a lighter second flush in late summer on English lavender, and it stops the plant putting energy into seed.

When should lavender be pruned?

Right after flowering, which is mid to late summer for English lavender and late summer for most hybrids, and the cut should be finished by about six weeks before the first frost so new growth hardens off. A second lighter tidy in early spring removes winter damage. Avoid any significant cutting in autumn — soft regrowth going into winter is what kills lavender in cold wet climates.

How hard can you cut lavender back?

By about a third of the plant, always staying within green leafy growth, and never into the bare woody base. Lavender has very few dormant buds in old wood, so a stem cut below the green does not reshoot — it dies, and so does everything above it. That single rule explains almost every lavender killed by pruning. If you must reduce an overgrown plant, do it over two or three years, taking a third at a time and only where green shoots remain.

Can a woody leggy lavender be saved?

Partly, and often not. Where there is still green growth low on the stems you can reduce it gradually over two or three seasons, cutting back to just above that growth each year after flowering. Where the base is bare grey wood with leaves only at the tips, the plant will not regenerate and replacement is the honest answer. Lavender is a short-lived shrub — eight to twelve years is a normal life, and an annual trim from year one is what gets it there.

When should I harvest lavender for drying?

When about a third of the flowers on a spike have opened and the rest are still in bud, picked on a dry morning after the dew has gone. That stage holds the most essential oil and the flowers hold together best when dried. Cut long stems, bundle twenty or so loosely with a band and hang them upside down somewhere dark, dry and airy for two to four weeks. Harvesting is also deadheading, so a plant you cut for drying may need no further trim beyond shaping.

Does deadheading make lavender flower again?

Often, on English lavender and its hybrids, and less reliably on French and Spanish types. Removing spent spikes promptly after the first flush frequently prompts a second, lighter flowering in late summer, because the plant is not committed to setting seed. The second flush is smaller and shorter, and in cooler climates it may not come at all — treat it as a bonus rather than the reason for deadheading, which is primarily about shape and longevity.

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