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The best time to prune lavender plants is in early spring just as new growth begins to appear.
Getting the timing right for how and when to prune lavender plants is one of the most important things you can do for a healthy, long-lived shrub.
If you prune lavender too late in the season, you risk cutting into old wood that won’t regrow, leaving you with bare, woody branches.
On the flip side, if you never prune lavender at all, your plant becomes leggy, woody, and stops producing those gorgeous, fragrant blooms.
In this post, we’ll walk you through exactly when to prune lavender, how to prune lavender correctly, and the common mistakes to avoid so your lavender thrives for years.
Let’s dig in.
When To Prune Lavender Plants: The Perfect Timing
Pruning lavender plants at the right time is all about understanding their growth cycle.
Lavender is a woody perennial, meaning it has soft green growth on top and older, tougher wood at the base.
The key rule is to always prune lavender while the plant is actively growing, never during dormancy.
Here’s a breakdown of the best times to prune lavender plants throughout the year.
1. Early Spring: The Main Pruning Window
This is the single most important time to prune lavender plants.
Wait until you see fresh green shoots emerging from the base of the plant, usually around March or April depending on your climate.
At this stage, you should cut back about one-third to one-half of the plant’s growth.
Pruning lavender in early spring encourages bushy, compact growth and sets the stage for a spectacular bloom later in the summer.
This is also the time to remove any dead or frost-damaged stems from the previous winter.
2. Mid-Summer: A Light Trim After Flowering
Once your lavender finishes its first big flush of flowers, usually in July, you can do another prune.
This is called a post-bloom trim, and it’s much lighter than the spring cut.
Simply shear off the spent flower stalks and about an inch of green foliage.
Pruning lavender plants in summer not only keeps them looking tidy, but it also encourages a second, smaller flush of blooms in early fall.
Plus, it stops the plant from putting all its energy into seed production.
3. Avoid Late Fall or Winter Pruning
You might be tempted to tidy up your lavender before winter, but resist the urge.
Pruning lavender in fall or winter leaves open wounds that are vulnerable to frost damage and rot.
The soft new growth that results from fall pruning is also highly susceptible to winter kill.
Instead of pruning, just leave the plant alone and let the dried flower stems provide some natural protection from the cold.
How To Prune Lavender Plants: Step-By-Step Guide
Now that you know when to prune lavender, let’s talk about how to prune lavender properly.
The technique is just as important as the timing, because cutting into the wrong part of the plant can cause permanent damage.
Lavender only produces new growth from the green, soft stems.
Once you cut into the brown, woody base, those branches will never regrow.
So here’s how to prune lavender plants without ruining them.
1. Use Sharp, Clean Bypass Shears
Dull blades can crush the stems and invite disease, so always use clean, sharp bypass shears.
Sterilize your shears with rubbing alcohol before you start, especially if you’ve been pruning other plants.
This simple step prevents the spread of fungal infections between your garden plants.
2. Cut Above the New Green Shoots
When you prune lavender in spring, look for the cluster of new green leaves at the base of the plant.
Make your cuts about one to two inches above this new growth.
Never cut below the green shoots into the bare wood.
This ensures you’re only removing the old, spent growth while leaving plenty of leaf nodes for the plant to push out new branches from.
3. Shape It Like a Mound, Not a Flat Top
Lavender looks its best when pruned into a slightly rounded, mounded shape.
Avoid cutting it into a flat, hedge-like line, since that promotes weak, spindly growth at the center.
Aim to keep the center of the plant slightly higher than the outer edges.
This allows sunlight to reach the entire plant and encourages even, dense growth.
4. Deadhead Spent Blooms Regularly
Between your main pruning sessions, take a few minutes to deadhead.
Simply snap off or snip the faded flower spikes as soon as they start to look tired.
Regular deadheading keeps lavender plants productive and also prevents them from becoming leggy and sprawling.
This is the easiest form of pruning lavender and it barely takes any effort at all.
Common Pruning Mistakes To Avoid
Even experienced gardeners make mistakes when they prune lavender plants.
But with a few simple guidelines, you can keep your lavender looking perfect year after year.
Here are the biggest pitfalls and how to avoid them.
1. Cutting Into Old Wood
This is the number one way people kill their lavender.
If you prune lavender back into the thick, brown, woody stems, those branches are dead.
They won’t sprout new leaves, and you’ll end up with a skeleton of bare branches.
Always prune only into the soft, green growth, and never cut below the lowest set of leaves.
2. Pruning Too Late in the Season
We touched on this earlier, but it’s worth repeating.
Pruning lavender plants in late summer or early fall stimulates tender new growth that can’t survive the winter.
This new growth is also a magnet for pests and fungal diseases.
Stick to your early spring prune and your post-bloom summer trim, that’s all your lavender really needs.
3. Being Too Gentle
On the other end of the spectrum, some gardeners are so scared of cutting into wood that they barely prune at all.
If you only snip off the very tips of the stems, lavender plants will become leggy and top-heavy within just a few years.
Be brave and cut back at least a third of the plant’s height each spring.
This hard prune is what keeps lavender plants dense, healthy, and bursting with flowers.
4. Ignoring Soil Drainage After Pruning
Pruning lavender puts the plant under a bit of stress, so you need to make sure its growing conditions are optimal.
Lavender hates wet feet, and poor drainage is a common cause of death after pruning.
After your spring prune, check that your lavender isn’t sitting in soggy soil.
If it is, consider adding some grit or sand around the base of the plant to improve drainage.
A light application of a balanced, slow-release fertilizer after pruning can also help new growth along.
So, How And When To Prune Lavender Plants?
The best time to prune lavender plants is early spring, as soon as you see those fresh green shoots appearing at the base.
That’s your main pruning event, where you cut back a third to half of the plant to promote strong, healthy growth.
Then, give your lavender a lighter trim in mid-summer after the first bloom to keep it neat and encourage more flowers.
And to prune lavender properly, always use sharp shears, cut above the green growth, and never, ever cut into old wood.
If you follow these simple steps for when and how to prune lavender plants, you’ll be rewarded with a lush, fragrant, and beautifully shaped shrub for years.
Happy gardening!