Pruning lavender each year helps keep it compact, encourages flowering growth and reduces the chance of a woody, open center. The key is to trim green growth without cutting far into old, leafless wood, which often fails to sprout again. Use clean, sharp tools and choose a dry day; the best timing depends on your climate and whether your lavender flowers once or more than once.
What You’ll Need
- Sharp bypass pruners for individual stems, or clean garden shears for several plants.
- Gloves and, if the plant is large or dense, long sleeves to protect your hands and arms.
- A bucket or tarp for collecting clippings.
- Rubbing alcohol or household disinfectant for cleaning blades, especially between plants that look diseased.
Step-by-Step
- Identify the lavender and check its condition. English lavender (Lavandula angustifolia) is generally hardy and often flowers in early to midsummer. French and Spanish lavenders, including many varieties with topped or toothed leaves, are less cold-hardy and may flower over a longer season. If you do not know the variety, identify whether it has finished its main flush and avoid a hard autumn cut in a cold climate.
- Choose the right pruning window. For most English lavender, do the main trim after the flowers fade, usually in late summer. In cold regions, finish early enough that new growth has time to harden before frost. In mild climates, a light tidy-up in spring can remove winter-damaged tips. Repeat-flowering types can be deadheaded after each flush, but avoid removing substantial growth late in the season.
- Inspect before cutting. Look for green, leafy stems and distinguish them from thick, gray-brown, leafless wood at the base. Check for dead, broken or diseased growth. If the plant is very woody, sparse or neglected, plan a conservative trim rather than trying to make it small in one go.
- Remove spent flower stalks. Gather a small handful of stalks and cut them back to just above the leafy part of the plant. If you are also shaping the plant, make each cut within green growth, leaving plenty of leaves below it. Do not cut all the way down to bare stems just to remove every flower spike.
- Shape the plant lightly. Trim the soft green growth to form a rounded mound, with the top slightly narrower than the base so sunlight reaches lower branches. A common guide is to remove about one-third of the current green growth, but use the plant’s leafy growth as the limit: never take a routine cut into leafless old wood. The exact amount varies with plant size and vigor.
- Thin damaged stems selectively. Cut dead, broken or obviously diseased stems back to healthy growth. If a whole branch is dead, remove it at its point of origin without damaging nearby stems. Disinfect pruners between plants if disease is suspected, and avoid cutting into healthy woody framework.
- Collect clippings and check the shape. Clear cuttings from the plant and ground to improve airflow and reduce damp debris. Step back and look for an even outline, then make only small adjustments. Lavender does not need to be shaped into a tight ball.
- Water and monitor appropriately. Established lavender in well-drained soil usually needs no special watering after a light trim. If the soil is very dry, water at the base rather than soaking the foliage. Do not apply heavy fertilizer to push soft growth, and keep an eye out for new shoots and signs of stress over the following weeks.
Common Mistakes
- Cutting into bare, old wood: Lavender often has little ability to resprout from leafless woody stems. Keep cuts in leafy growth; if a plant has no green growth on a branch, remove only clearly dead wood or leave it if you are unsure.
- Pruning too hard all at once: Taking the plant back to a small stump can leave it permanently bare or kill it. A badly overgrown plant may be better replaced, or reduced gradually over more than one season only where healthy green shoots remain.
- Trimming at the wrong time: A hard late-season cut can leave tender shoots vulnerable to cold. In frosty areas, do the main trim after flowering but well before winter; use spring for light removal of winter damage.
- Using dull or dirty tools: Ragged cuts heal poorly, while contaminated blades can spread disease. Sharpen and clean tools before starting.
- Overwatering after pruning: Lavender prefers well-drained soil and is vulnerable to root problems in wet conditions. Water only when needed, and do not leave the plant sitting in waterlogged soil.
Tips
- For a new plant, wait until it is established and showing strong growth before beginning regular shaping. Pinching or lightly trimming young tips can encourage branching, but do not remove so much that the plant is weakened.
- Keep the base open and the sides gently sloped rather than clipping the lower branches shorter than the top. This helps light and air reach the plant’s interior.
- Prune on a dry day, preferably when temperatures are moderate. Wet foliage and extreme heat can add stress and make it harder to spot the plant’s natural shape.
- If you want to dry the flowers, harvest flower stalks when their buds are colored and just beginning to open, then bundle them loosely. You can make the post-flowering trim after harvesting.
- Lavender generally thrives in full sun and sharply drained soil. If it keeps becoming leggy or woody despite careful pruning, check that it is not shaded or growing in heavy, persistently wet soil.
Troubleshooting
The plant looks brown or bare after pruning. First check whether any green leaves or flexible shoots remain. Do not cut further to even out the shape. Give the plant time during the growing season, provide sun and good drainage, and water only if the soil is dry. If the entire plant is brittle and brown with no live shoots, it may be dead; scratch a small stem lightly to check for green tissue beneath the surface.
I accidentally cut into old wood. Stop pruning that area. If green shoots are present lower down, leave them intact and see whether they grow. Avoid applying fertilizer or repeatedly watering in an attempt to force recovery. A branch that remains bare may not regrow.
The plant is lopsided or too large. Avoid a severe corrective cut. Remove only a modest amount of green growth now, then reassess after it grows back. If there is not enough leafy growth to reduce its size safely, consider moving it in a suitable season or replacing it with a more compact variety.
There are few flowers the following year. Check for insufficient sun, wet soil, excessive fertilizer, frost damage or pruning that removed too many flowering shoots. Restore suitable growing conditions and limit the next trim to spent flowers and a light shaping cut within green growth.
Frequently Asked Questions
How much should I cut off lavender?
For a routine trim, remove spent flower stalks and roughly one-third of the soft green growth at most. Leave leafy growth below every shaping cut and do not cut into bare wood.
Can I prune lavender in spring?
Yes. In spring, remove dead or winter-damaged tips and lightly shape green growth. Save major shaping for after the main flowering period where possible, and do not cut into leafless stems.
Should I cut lavender back for winter?
Do not give it a hard winter cut. In cold regions, finish the main trim after flowering and before frost; remove any winter damage the following spring.
Can I cut lavender back to the ground?
No. Cutting to the ground or into leafless woody stems often prevents recovery. If an old plant has no green shoots low enough to make a safe cut, replacing it is usually more reliable than a severe renovation.
How often should lavender be pruned?
Most plants benefit from one main trim each year after flowering. Repeat-flowering varieties can also be deadheaded after later flushes, as long as you do not make a heavy cut near winter.
Can I prune lavender while it is flowering?
You can harvest flower stems or remove a few damaged ones, but avoid cutting back the whole plant during its main bloom if you want to enjoy the flowers. Do the main shaping after the flush fades.