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You can prune lavender in the summer, and doing so is actually one of the best things you can do for your plants.
If you’ve been wondering whether summer pruning lavender is a good idea, the short answer is a resounding yes, as long as you time it right and use the correct technique.
Pruning lavender in the summer isn’t just about keeping it tidy, it’s essential for encouraging a second flush of blooms, maintaining a compact shape, and preventing the plant from becoming woody and leggy.
In this post, we’ll break down exactly when and how you can prune lavender in the summer, the key differences between summer and spring pruning, and common mistakes to steer clear of so your lavender thrives.
Let’s dig into why summer is the perfect season to grab your shears.
Why You Can Prune Lavender In The Summer
You can prune lavender in the summer primarily because this is when the plant is in its active growth phase and can recover quickly from a trim.
Unlike some shrubs that go dormant in the heat, lavender actually thrives in warm, sunny conditions, which means it has plenty of energy to push out new growth after being pruned.
Summer pruning lavender also serves a very specific purpose that differs from your spring haircut, and understanding that purpose will help you get the most from your garden.
1. Summer Pruning Encourages a Second Bloom
The main reason you can prune lavender in the summer is to stimulate a second round of flowers later in the season.
After the first flush of blooms fades in early to midsummer, those spent flower spikes are just sitting there, diverting energy away from new growth.
By cutting them back, you’re essentially telling the plant to produce another set of flower buds.
This is why pruning lavender in the summer is often called “deadheading on steroids,” because you’re not just removing individual flowers, you’re shaping the whole plant to encourage fresh, fragrant blooms.
If you skip this step, your lavender will likely only flower once, and the plant may start to look scraggly.
2. It Prevents Woody, Leggy Growth
Another critical reason you can prune lavender in the summer is to stop the base of the plant from becoming woody and bare.
Lavender doesn’t regrow well from old wood, so if you let it get too tall and woody, you’ll end up with a plant that’s all stems at the bottom and only a few leaves at the top.
Summer pruning lavender keeps the plant bushy and full by forcing it to branch out from the lower, greener parts of the stems.
Regular light trims throughout the warm months are far better than letting the plant go wild and then trying to hack it back later.
3. It Keeps the Plant Healthy and Airy
You can prune lavender in the summer to improve airflow through the center of the plant, which is vital for preventing fungal diseases like root rot and powdery mildew.
Lavender hates humid, stagnant conditions, and a dense, overgrown plant can trap moisture right where it shouldn’t be.
By opening up the center a little and removing any dead or diseased stems, you’re letting the breeze flow through and the sun reach every part of the plant.
This simple act of summer pruning lavender goes a long way toward keeping your plant vigorous and disease-free.
When To Prune Lavender In The Summer
Timing is everything when you decide to prune lavender in the summer, so you’ll want to pay close attention to your plant’s bloom cycle.
1. Right After the First Bloom Fades
The absolute best time to prune lavender in the summer is as soon as the first wave of flowers starts to lose their color and dry out.
This usually happens in early to mid-July, depending on your climate and the specific variety of lavender you’re growing.
Don’t wait until the flowers are completely brown and crispy, but do wait until most of the blooms on each spike have opened and begun to fade.
Pruning lavender in the summer at this precise moment gives the plant the maximum amount of time to produce and mature a second set of blooms before autumn arrives.
2. Avoid Pruning During Extreme Heatwaves
While you can prune lavender in the summer, you’ll want to avoid doing it during a brutal heatwave when temperatures are soaring above 90°F (32°C) for days on end.
Pruning causes a bit of stress to the plant, and adding extreme heat on top of that can cause the cuts to dry out too quickly.
If a heatwave is hitting your area, just wait a week or two until temperatures moderate a bit, the lavender won’t mind the extra few days.
3. Stop Pruning About Six Weeks Before the First Frost
You can prune lavender in the summer, but you need to stop by late August or early September, depending on your growing zone.
If you prune too late in the season, the tender new growth won’t have time to harden off before winter arrives.
That soft, new growth is very susceptible to frost damage, which can kill the entire plant in cold climates.
Always give your lavender a solid six weeks of mild weather after pruning so it can mature properly.
How To Prune Lavender In The Summer Correctly
Now that you know you can prune lavender in the summer, let’s talk about the correct way to do it so you don’t accidentally harm your plant.
1. Use Clean, Sharp Shears
Before you start summer pruning lavender, make sure your pruning shears are clean and sharp.
Dull blades can crush the stems, which makes them more prone to disease and slower to heal.
Wipe your shears down with rubbing alcohol to kill any pathogens that might be lingering from other plants.
2. Cut Above the Green Leaves, Not Into the Wood
The golden rule of pruning lavender in the summer is to never cut into the brown, woody part of the stem.
Instead, follow the flower stem down to where it meets the green, leafy growth, which is usually about two to three inches above the woody base.
Make your cut just above a set of healthy green leaves, and those leaves will quickly sprout new branches.
If you cut into the woody base, that part of the stem will not regrow, and you’ll be left with bare, ugly branches.
3. Shape the Plant into a Mound
As you prune lavender in the summer, try to maintain a nice, rounded mound shape rather than cutting it flat on top.
The goal is to keep the plant wider at the base and slightly narrower at the top, which allows sunlight to hit the lower leaves too.
Imagine you’re giving the lavender a nice haircut by working your way around the plant, snipping a few stems at a time, and stepping back to check your progress regularly.
4. Remove Any Dead or Damaged Stems
While you’re pruning lavender in the summer, take the opportunity to snip out any stems that are dead, diseased, or damaged.
These won’t recover, and leaving them in place just wastes the plant’s energy and can spread pests or disease.
Pull them right out or cut them down to the base, but only if they’re truly dead, remember that green stems can still grow.
Common Mistakes When Pruning Lavender In The Summer
Even though you can prune lavender in the summer, there are a few pitfalls that even experienced gardeners fall into.
1. Cutting Back Too Hard
The most common mistake is treating summer pruning lavender like a hard rejuvenation prune.
Summer pruning is meant to be a light to moderate trim, not a severe cutback.
Save the hard pruning (cutting back into the woody base) for early spring when the plant is just waking up and has more energy reserves.
If you hack it back too hard in summer, you might stress the plant so much that it won’t bloom again, and it could even die.
2. Pruning on a Rainy Day
You can prune lavender in the summer, but you shouldn’t do it right before or during heavy rain.
Fresh cuts are open wounds, and if rain splashes them immediately, you increase the risk of fungal spores entering the plant.
Choose a dry, sunny day for your summer pruning lavender session, and the cuts will heal quickly under the warm sun.
3. Fertilizing Right After Pruning
After you prune lavender in the summer, avoid the temptation to give it a boost of fertilizer.
Lavender is a Mediterranean plant that actually prefers poor, lean soil.
Fertilizing with nitrogen will just produce a lot of soft, floppy leaves at the expense of flowers and will make the plant more vulnerable to frost later.
Just leave it alone, water it deeply but infrequently, and let the natural growth cycle do its thing.
So, Can You Prune Lavender In The Summer?
You can prune lavender in the summer, and it’s one of the most beneficial tasks you can do for your garden.
Summer pruning lavender encourages a second flowering, prevents woody growth, and keeps your plants healthy and attractive.
Just remember to prune right after the first bloom fades, avoid the hottest days, never cut into brown wood, and always stop by early September.
Whether you’re a seasoned gardener or just getting started, you’ll find that pruning lavender in the summer is quick, satisfying work that pays off with beautiful, fragrant blooms well into the season.
Happy pruning, and enjoy your gorgeous, thriving lavender garden.