How to prune true lavender (Lavandula angustifolia)

Why pruning lavender matters

Lavandula angustifolia, true or English lavender, grows as a compact shrub (to 1 metre tall) with fine foliage and purple to lilac flowers in July-September. Without pruning, however, lavender quickly becomes leggy: the base becomes bare, the top gets thick and odd, and you get fewer flowers.

Annual pruning in March keeps your lavender compact, dense, and floriferous. This is not optional - it is essential for a healthy, long-lived plant.

Why lavender dies without pruning

Many gardeners notice their lavender suddenly dies after 5-10 years. Usually it is lack of pruning. Lavender grows leggy: branches become long, thin out at the base, and the plant goes out of balance. The centre becomes bare and woody, and rain and foot traffic can make the plant sick.

By pruning annually - especially after flowering, and a hard prune in March - you prevent this. Your plant stays healthy, dense, and lives 15-20+ years.

The right timing

March: This is the main pruning time. Your lavender is just finishing winter dormancy, new growth starts, and cut wounds heal fast. Cut back in March to about 50% of last year's growth (see steps below).

June: Light late-summer pruning. Once flowers begin appearing (late May), you can gently tidy the plant - not hard cutting, but pinching tips for neater form and continuous bloom. This is optional.

July-August: During bloom you can remove spent flowers. This helps more blooms form and looks neater.

October-November: DO NOT prune. Autumn and winter pruning is dangerous - the plant recovers poorly and can freeze.

Practical pruning steps

Step 1: Check for all dead wood

Before you start shape pruning, walk around and remove all dead wood. You recognise it by:

• Brown colour
• No leaves
• Brittle, dry texture

Cut dead wood entirely back to healthy, green wood. This is essential.

Step 2: Cut the whole plant back

This is the core step. In March cut your entire Lavandula angustifolia back to roughly 30-40 cm above ground. This sounds aggressive, but it is right. Lavender tolerates this well and grows back much denser.

Rule of thumb: Cut back to roughly halfway last year's growth. If your plant grew to 60-80 cm last year, cut now to 30-40 cm.

Step 3: Make sure you don't cut into old wood

This is important: do not cut into brown, old, leafless wood. This does not regrow. Always cut just above where green is still visible with small leaves.

Step 4: Ensure neat form

After this hard pruning your plant looks bare. No worry. Within weeks it grows back in a dense, round shape. The new growth is much denser and fuller than unpruned wood.

Late-summer maintenance

Remove spent flowers

During bloom (July-August), you can pinch off spent flowers. This gives two benefits:

1. It looks neater
2. The plant makes more flower shoots instead of setting seed

This is optional, but many gardeners do it because blooming lavender stays beautiful longer.

Light shape adjustments

In June, as new growth begins expanding, you can gently pinch tips or lightly shear. This helps a neater, rounder shape. But this is not essential - March is the key moment.

Lavender in pots

Prune potted lavender the same way - March back to 50%, prevent seed by removing spent flowers. Potted lavender needs only 15-20 litre pot. Ensure good drainage (lavender hates wet roots).

Frequently asked questions

My lavender has become huge and I want it smaller. Can I cut harder?

Yes, but carefully. Lavender accepts hard cutting to roughly 20-30 cm if your plant has become very large. But make sure you do not cut into old, brown wood - it does not regrow. Cut only where green/leaves are still visible.

A very wild plant is best hard pruned in March (20-30 cm), or if it is really serious, completely replaced.

My lavender flowers poorly. Why?

Usually: (1) Too much shade. Lavender loves full sun (6+ hours daily). (2) Not pruned. Unpruned lavender flowers poorly. (3) Too much water/feed. Lavender loves dry, poor soil. (4) Plant still young (first two years).

Fix: move to more sun, prune in March, give no extra water/feed, and wait patiently.

Can I dry spent flowers for potpourri?

Yes! Cut spent flowers and hang dry in shade. Dried lavender smells lovely for weeks. This is a nice bonus of lavender pruning.

When does my lavender become too old and need replacement?

Well-cared-for lavender lives 15-20+ years. But after 10-15 years your plant may start weakening. If your plant, after years of hard pruning, no longer grows well, it is time to replace. Plant new Lavandula angustifolia nearby, and prepare yourself mentally.

Is Lavandula angustifolia the same as French lavender (Lavandula stoechas)?

No, different species with different appearance and different pruning needs. Angustifolia is the "true" English lavender - the species for cooler climates. Stoechas (French) is for warmer climates and grows somewhat differently. This article covers angustifolia.

Step-by-step

Step 1: Wait for March

Mark your calendar. March is lavender pruning month. Not earlier.

Step 2: Check for dead wood

Walk around and mark all dead wood (brown, leafless). This must go.

Step 3: Remove dead wood

With pruners, cut dead wood entirely back to healthy wood.

Step 4: Cut the whole plant back

Cut your entire plant back to roughly 30-40 cm above ground. This is about halfway last year's growth.

Step 5: Ensure neater form

After pruning your plant looks bare. Within weeks it grows back in a dense, round shape.

Step 6: Optional July-August

Remove spent flowers for neatness and more bloom.

Lavender varieties

Angustifolia 'Hidcote': Compact (60 cm), deep purple, excellent for small gardens.

Angustifolia 'Munstead': Small (45 cm), lilac, robust, ideal for balconies.

Angustifolia 'Grosso': Larger (90 cm), purple, many flowers, good for cut lavender.

Angustifolia 'Alba': White, 60 cm, elegant contrast with purple varieties.

Prune all these varieties the same way: March back to 50%.

Discover your garden

At [gardenworld.app](https://gardenworld.app) you can see how Lavandula angustifolia fits your garden plan. Plant lavender for dry, sunny spots: front of borders, along paths, or in dry chalk gardens. See how flower colour fits beside other plantings.