Pruning herbs is mostly harvesting with intent. Every time you pinch the tip of a basil plant, you are pruning it — and that pinch is what makes it branch, grow bushy, and produce far more leaves than a plant left to grow tall and thin. Left alone, most herbs grow leggy, flower early, and turn woody; pruned regularly, they stay compact, leafy and productive for months or years.
But herbs do not all prune the same way, and the most important rule in this guide is the one that kills more rosemary and lavender plants than any other mistake: never cut a woody herb back to bare wood, because old wood without leaves will not sprout again. Soft herbs can be cut hard and will regrow; woody herbs must always be cut back to green growth with leaves on it. This guide covers each herb group in turn, and when to prune. If you are unsure about a plant in your garden, check your local extension service for advice before you cut.
Pinching soft herbs: basil, mint and cilantro
Soft, fast-growing herbs are pruned by pinching, and the sooner you start, the better. Basil is the classic example: when a young plant has three or four pairs of leaves, pinch out the growing tip just above a pair of leaves, and two new shoots will grow from that point. Pinch every week or two through the summer, and a single basil plant becomes a bushy, multi-branched plant with dozens of picking points instead of one tall stem with a few leaves. The same works for mint: pinch the tips regularly to keep it bushy, and cut it back hard — to a few centimetres above the soil — once or twice a season if it gets leggy, because mint regrows vigorously from its base.
Cilantro and dill are different: they are short-lived annuals, and pinching does not make them bushy in the same way. For cilantro, pick the outer leaves regularly and pinch off any flower stalk as soon as it appears, which buys you a few more weeks of leaves before it bolts. For dill, pick the feathery leaves as you need them, and let one plant go to seed if you want dill seed for cooking. Parsley is pruned by picking: take the outer stems at the base, which encourages new growth from the centre, and cut the whole plant back by a third in midsummer if it gets tired — it will regrow with fresh, tender leaves.
Woody herbs: rosemary, lavender, sage and thyme
Woody herbs need a lighter, more careful hand. Rosemary should be pruned lightly after flowering, cutting back the soft green growth by a third, but never cutting into the brown, leafless wood at the centre of the plant — old rosemary wood does not sprout new shoots, and a plant cut back to bare wood will die. The same rule applies to lavender: trim it lightly after flowering, cutting back to just above green growth with leaves on it, and never cut into the woody base. A lavender plant that is trimmed lightly every year stays compact and floriferous for many years; one that is left unpruned for years becomes woody and bare, and cannot be rescued by hard pruning.
Sage is pruned in spring: cut back the previous year's growth by about a third, removing dead and crossing stems, and pinch the tips through summer to keep it bushy. Thyme and oregano are pruned by shearing: after flowering, cut the whole plant back by about a third with shears, which keeps it compact and encourages fresh growth. Thyme that is sheared every year stays dense and productive; thyme that is never cut becomes woody in the centre and sparse. Our pruning calendar can help you time these jobs through the year.
When to prune each herb
Timing matters as much as technique. Prune rosemary and lavender after flowering, in late summer, so the new growth has time to harden before winter — pruning them late in autumn pushes soft growth that frost damages. Prune sage and thyme in spring, as new growth starts, and shear them lightly again after flowering. Pinch basil and mint through the whole growing season, from when they are young until the first frost. Cut chives back to a few centimetres above the soil when they get tired or after flowering, and they will regrow with fresh leaves within weeks.
Never prune a woody herb hard in autumn, and never prune any herb in the depths of winter, when the cuts will not heal and frost can damage the exposed wood. Do your main pruning when the plant is growing actively and can heal quickly. And always use clean, sharp secateurs or scissors — a clean cut heals fast, while a torn or crushed stem invites disease. If a plant is diseased, prune the affected growth first, dispose of it in household waste rather than compost, and clean your tools before you move to the next plant. For help identifying a problem, use our plant disease checker or check your local extension service.
Rejuvenating a neglected herb plant
A herb that has not been pruned for years can often be rescued, but only if you work gradually. For thyme and oregano, shear the plant back by a third in spring, feed it lightly with compost, and it will usually regrow from the base. For sage, cut back the oldest stems to the base in spring, leaving the younger growth, and the plant will fill out again. For chives, dig up the clump, divide it, and replant the healthiest pieces — division rejuvenates a tired clump far better than pruning alone.
For rosemary and lavender, be honest about what can be saved. If the plant is woody in the centre with green growth only at the tips, you cannot cut it back to the wood and expect it to regrow — it will not. Trim it lightly to shape, take cuttings from the healthy green tips to grow replacements, and plan to replace the old plant within a year or two. Taking cuttings is the real rescue for a woody herb: a rosemary cutting taken in summer roots within weeks, and a new plant grown from it will be compact and productive while the old plant fades. See our herbs propagation guide for the cutting method in detail.
Tools and hygiene
Good pruning starts with good tools. Use sharp secateurs for woody stems such as rosemary and sage, sharp scissors or your fingertips for soft herbs such as basil and mint, and shears for shearing thyme and oregano. Blunt tools crush stems instead of cutting them, and crushed stems heal slowly and invite disease. Keep a cloth and a little disinfectant or rubbing alcohol with you, and wipe the blades between plants, especially if you are pruning a plant that looks diseased.
Wear gloves when you prune rosemary and lavender, because their woody stems are stiff and can scratch, and wash your hands after pruning. Put prunings in the compost if they are healthy, and in household waste if they are diseased. And keep the prunings of woody herbs — rosemary and lavender stems make fragrant kindling, and lavender flower heads can be dried for scenting drawers.
Common mistakes
The most serious pruning mistake is cutting rosemary or lavender back to bare wood, which kills the plant because old wood does not sprout again. The second is never pinching basil, so it grows tall, flowers, and stops producing useful leaves. The third is pruning woody herbs hard in autumn, so soft new growth is damaged by frost. The fourth is letting basil and cilantro flower — once they flower, leaf production stops, so pinch the buds off. And the fifth is using blunt tools, which crush stems and invite disease. Prune little and often, always cut back to green growth with leaves on it, and your herbs will stay bushy and productive for years.
| Herb | How to prune | When | Never do this |
|---|---|---|---|
| Basil | Pinch tips above a leaf pair | Through summer, every 1–2 weeks | Let it flower; leaf production stops |
| Mint | Pinch tips; cut back hard if leggy | Through summer | Plant it in open ground; it spreads |
| Rosemary | Light trim of green growth only | After flowering, late summer | Cut to bare wood; it will not regrow |
| Lavender | Light trim above green growth | After flowering, late summer | Cut into the woody base |
| Thyme, oregano | Shear back by a third | After flowering; spring tidy | Leave unpruned for years; centre goes woody |
| Sage | Cut back by a third in spring | Spring, as growth starts | Cut hard in autumn; soft growth frosts |
| Chives | Cut to a few cm above soil | When tired or after flowering | Leave flower heads to set seed unchecked |
Frequently asked questions
How do I keep basil bushy?
Pinch out the growing tip just above a pair of leaves when the plant is young, and keep pinching every week or two through summer. Each pinch makes two new shoots grow, so the plant becomes a bush instead of a single tall stem. Pinch off flower buds as soon as they appear.
Can I cut rosemary back hard?
No — never cut rosemary back to bare, leafless wood, because old wood does not sprout new shoots and the plant will die. Prune lightly after flowering, cutting back only the soft green growth by about a third, always leaving leaves on the stems you cut.
When should I prune lavender?
Trim lavender lightly after flowering in late summer, cutting back to just above green growth with leaves on it. Never cut into the woody base, and do not prune hard in autumn — the new growth needs time to harden before winter.
How do I prune thyme and oregano?
Shear thyme and oregano back by about a third after flowering, and again in spring if they look straggly. Regular shearing keeps them dense and compact; plants that are never cut become woody in the centre and sparse.
My rosemary is woody and bare in the middle — can I save it?
Probably not by pruning — rosemary cut back to bare wood will not regrow. Trim it lightly to shape, take cuttings from the healthy green tips to grow replacements, and plan to replace the old plant within a year or two.