How to Prune Rosemary – When and How to Cut Back Rosemary Plants

Rosemary is one of the easiest herbs to grow, but without occasional pruning, it can become woody, leggy, and overgrown. Knowing how to prune rosemary, when to do this, and how much to cut back, helps keep plants compact, vibrant, and producing fresh growth.

Whether you are shaping a mature rosemary bush, trimming a container plant, or determining if an older plant can withstand more rigorous pruning, the right approach makes all the difference.

This guide explains when to prune rosemary, how to trim it safely, and when hard pruning may be beneficial for reviving an overgrown plant.

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When to prune rosemary

The best time to prune rosemary is in early spring to early summer, right after the plant flowers.

• Avoid heavy pruning before cold weather since new growth could be damaged by frost.
• Avoid pruning new plants until they are established in your garden.
• A general rule is to prune no later than about 4-6 weeks before the first frost.

How to prune rosemary plants

The only tools you will need are clean, sharp pruning shears or garden scissors for most rosemary plants, or a pair of ratcheting pruners and garden gloves for older woody stems.

Regular pruning of rosemary

• Clip off any faded flowers.
• Identify fresh growth vs woody growth.
• Regularly trim the fresh growth of the plant throughout the growing season.
• Snip the stems at an angle just above a cluster of leaves.
• Take care not to prune too far into the old wood.
• To make the plant busier, remove about 1 – 2 inches from all of the branches.

Hard pruning of rosemary

Photo credit Flickr

Rosemary is a perennial herb, and if it grows freely in the garden, it can reach 6-8 feet. The growth of older, mature plants can get very woody and will require hard pruning.

• A good rule of thumb is not to cut back more than ⅓ of the plant at one time.
• Make cuts just above the new, green leaves.
• Avoid cutting into old, bare wood, as this rarely regrows.
• Thin out the center of overgrown plants by cutting inward-facing stems back to a healthy side shoot.

Protip: If your rosemary plant appears to be all thick wood, don’t chop it all down at once. Prune one or two of the old branches all the way to the ground. Then wait a few months until new growth appears and repeat the process on another woody branch.

How to prune rosemary plants in containers

Rosemary grown in containers is pruned much the same way as garden rosemary plants, but the goal is usually to maintain size and encourage fresh growth rather than reduce an overgrown shrub.

• Remove dead or weak stems and trim back soft green growth to maintain a compact shape.
• Avoid cutting deeply into thick woody stems unless the plant is very overgrown.
• Container rosemary often benefits from lighter, more frequent pruning rather than one heavy trim.
• Regular harvesting and shaping throughout the growing season can help keep plants bushy and prevent long, leggy stems.

Protip: If your rosemary seems crowded, dries out quickly, or stops putting on new growth, the issue may not be pruning at all. A larger container or fresh potting mix may help restore its vigor.

Do you need to prune rosemary every year?

Rosemary should be pruned at least once a year to keep a compact shape and to encourage fresh growth.

Pruning prevents the plant from becoming overgrown and woody, and it promotes the lush, bushy foliage that is needed for a healthy harvest.

What to do with rosemary clippings

Don’t throw those rosemary cuttings away. Put them to use in these ways:

• Rosemary can be preserved by drying, freezing, and made into butter and infused oil.
• Use the cuttings to propagate into new plants.
• Rosemary makes a great Thanksgiving herb for turkey.
• Add the woody rosemary clippings to your compost pile.
• Rosemary is also used in craft projects, from decorations on tablescapes to additions to gift-wrapped packages.

Related posts

Looking for more tips for pruning your plants? Check out these pruning and tools care guides.

• Pruning Shrubs – How and when to trim bushes
• Pruning Tips – How to prune plants like a pro
• How To Winterize Garden Tools – Keep your tools clean and sharp

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Admin note: This article on how to prune rosemary first appeared on the blog in September 2017. This post has been updated with new photos, a printable project card, and a slideshow video about growing rosemary.

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Yield: 1 list of pruning tips for rosemary

Pruning Rosemary – How and When to Trim Rosemary Plants

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Learn how to prune rosemary correctly to keep it compact and productive. You'll find the best time to trim rosemary, how much to remove, and when hard pruning is appropriate.

Active Time 30 minutes

Total Time 30 minutes

Difficulty easy

Estimated Cost $1

Materials

• I overgrown or woody rosemary plant

Tools

• Pruning shears
• Garden gloves
• Ratcheting pruners

Instructions

For general pruning:

1. Prune in late spring or early summer after the plant flowers.
2. Clean your shears with 70% isopropyl alcohol.
3. Remove any faded flowers.
4. Regularly trim the tips of the stems throughout the growing season.
5. Cut the stems on an angle just above a cluster of leaves.
6. Be careful not to cut too far into the woody area of the stem, since this rarely regrows.
7. Container rosemary plants benefit from lighter, more frequent pruning rather than one heavy trim.

For hard pruning

1. Don't cut back more than ⅓ of the plant at one time.
2. Make cuts just above the new, green leaves.
3. Thin out the center of overgrown plants by cutting inward-facing stems back to a healthy side shoot.
4. For very woody growth, concentrate on one section at a time.
5. Cut it back to the base of the plant.
6. Wait a few weeks for new growth to appear.
7. Repeat on the other sections.
8. Avoid heavy pruning too late in the year to keep frost from damaging new growth.

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