If your lavender has gotten a little leggy, gray at the base, or more twig than fluff by the time August rolls around, you are definitely not alone. I garden in a small Midwestern town where our summers can swing from sticky and stormy to bone-dry in what feels like the same week, and lavender often shows every bit of that stress. The good news is that August can be a very useful reset point. With the right cleanup, trimming, and soil care, you can help woody plants put energy into healthy new growth before fall settles in.

When I first started growing lavender, I treated it like any other flowering perennial, and that was my mistake. Lavender is a little pickier, especially around moisture, pruning depth, and airflow. In this article, I’ll walk you through the most important things I do in August to refresh tired plants, protect woody stems from further decline, and set them up for stronger shape and better bloom next season. And because I always think about real family gardens, I’ll also share a few simple, practical tips for folks who need low-fuss fixes that fit into a busy week.

1. Start by checking whether the plant is still salvageable

Before you prune a single stem, take 5 minutes to inspect the whole plant. A lavender shrub that is woody at the base is normal; a lavender shrub that is woody, split open, hollow in the center, and producing almost no green shoots may be too far gone. I gently spread the plant with both hands and look at three things: how much green growth is on the outer shell, whether any fresh shoots are emerging lower down, and whether the center is dead and brittle.

A good candidate for August rejuvenation still has at least 25% to 40% active green growth around the outside. If you scratch a stem lightly with your thumbnail and see green just under the bark, that stem is alive. If the scratched area is tan and dry all the way through on most stems, replacement may be more realistic than rescue. I know it is hard to pull a plant, but sometimes starting over with one healthy lavender is better than babying a failing shrub for another year.

2. Deadhead every spent flower stem cleanly

August is not the time to let faded flower stalks sit and drain energy. I cut each spent bloom stem back to just above a set of healthy leaves or side shoots. On most varieties, that means removing 4 to 8 inches of stem, depending on how long the flower spikes were. Use sharp hand pruners or garden snips, and wipe the blades with rubbing alcohol if you are moving from one plant to another.

This step alone tidies the plant and encourages it to shift energy away from seed production. In my yard, especially after a hot July, deadheading often coaxes a lighter second flush or at least a fresher mound of silvery green foliage. If you like to bring lavender indoors, this is also the moment to save the best stems for drying. I bundle 20 to 30 stems with kitchen twine and hang them upside down in a dry room for 10 to 14 days.

3. Trim back green growth, but never cut deep into bare wood

This is the biggest rule, and it is where many gardeners get into trouble. In August, I shape lavender by removing about one-third of the current season’s soft green growth. For a plant that is 18 inches tall, that usually means taking off 4 to 6 inches from the top and outer sides. The goal is to create a rounded mound, not a flat-top hedge.

Do not cut into old, leafless brown wood unless you can clearly see new green shoots emerging below your cut point. Lavender often does not resprout from completely bare old wood. I tell my kids it is a little like giving a haircut: trim the fresh growth, don’t buzz it down to the scalp. If your plant has mixed growth, prune each stem individually so every cut ends above living leaves. This takes longer than shearing, but it is much safer and gives a fuller result.

4. Open up the center for better air circulation

Woody lavender often gets dense around the outer shell while the middle turns congested, dry, or weak. In humid August weather, that trapped still air can lead to rot and fungal issues, especially if you have had repeated rain. I remove a few thin, crossing stems from the interior so light and air can move through the center. Usually 5 to 10 small stems per mature plant is enough.

You do not want to hollow the plant out, but you do want to reduce rubbing and crowding. Think “loosen” rather than “gut.” If your lavender is planted close to a sidewalk, fence, or another perennial, try to maintain at least 6 to 8 inches of open space around it. In my own beds, the plants that stay driest and breeziest are always the ones that age best.

5. Pull back mulch and fix soggy soil fast

Lavender and damp mulch are usually a poor mix in late summer. If wood mulch, shredded bark, or compost is pushed right up against the crown, pull it back so there is a clear 2- to 3-inch ring around the base. The crown needs to stay dry. I learned this the hard way after losing a beautiful plant in a rainy August because mulch held too much moisture around the stems.

If the soil stays wet for more than 24 hours after a good soaking rain, improve drainage now. Mix coarse sand or fine gravel into the top few inches around the plant, or top-dress with 1 to 2 inches of pea gravel instead of organic mulch. In heavier Midwestern clay, I sometimes gently work in a small bucket of crushed granite or gritty builder’s sand around older plants, being careful not to damage roots. Lavender prefers lean, sharply drained soil much more than rich, fluffy garden soil.

6. Water deeply but less often

One of the kindest things you can do in August is stop fussing over lavender with frequent shallow watering. Established plants usually do better with a deep soak every 7 to 10 days if the weather is very dry, rather than a little sprinkle every evening. I aim for roughly 1 inch of water total per week from rain or irrigation. If temperatures are in the 90s for several days, I may check soil moisture twice a week, but I still water only when the top 2 to 3 inches are dry.

Newly planted lavender is different and will need more attention, but older woody plants often decline from overwatering, not underwatering. Water at the base in the morning so leaves dry quickly. Avoid wetting the whole plant with overhead sprinklers late in the day. If your family uses a hose timer, set it for a slow soak of 20 to 30 minutes rather than a short daily cycle.

7. Skip high-nitrogen fertilizer and use restraint with feeding

Lavender does not need a big feeding in August, and too much fertilizer can push soft, floppy growth that will not mature well before cooler weather. If your plant is in reasonably good soil, I would skip fertilizer entirely. Healthy lavender often performs best in modest conditions.

If the plant is clearly pale and struggling in very poor soil, use only a light hand. A low-nitrogen product, such as a 2-4-4 or 3-5-5 formula, can be applied at half the label rate. For one medium shrub, that may be just 1 to 2 tablespoons scratched lightly into the soil surface away from the crown, followed by a careful watering. Do not use rich lawn fertilizer nearby, and do not top with heavy compost in hopes of “feeding it up.” Lavender prefers discipline more than pampering.

8. Remove weeds and crowding neighbors

When woody lavender starts looking tired, I often find that the problem is not only the lavender itself. Nearby weeds, volunteer grasses, or overgrown perennials may be stealing light and airflow. In August, I clear a neat circle around each plant, usually 12 to 18 inches wide depending on the mature size. Pull weeds by hand rather than chopping deeply with a hoe, since lavender roots can sit fairly close to the surface.

If a neighboring salvia, coreopsis, or catmint is flopping into your lavender, give it a trim too. I have one bed where my lavender always sulks when a mound of oregano gets too cozy. Once I cut the oregano back and restore some breathing room, the lavender perks up within a couple of weeks. For picky gardeners who want tidy lines, a gravel collar around each plant also helps keep that clean, dry look.

9. Watch for stem rot, crown damage, and hidden pests

August stress can make problems easier to spot if you look closely. Check the base of stems for blackening, mushiness, or a sour smell, which can point to crown rot. Also inspect for spittlebugs, small caterpillars, or webbing tucked into dense growth. Lavender is not usually a magnet for many pests, but weakened plants can attract trouble.

If you find one or two damaged stems, prune them out several inches below the affected area and throw that material away rather than composting it. If the entire crown is soft, the plant may not recover. For mild pest issues, a strong morning spray of water or hand removal is often enough. I avoid heavy treatments unless there is a serious outbreak, because lavender’s own fragrance and oils usually help it fend for itself when growing conditions are right.

10. Take cuttings now in case the old plant declines later

This is one of my favorite August insurance policies. If you have an aging woody lavender that still has healthy green tips, take softwood or semi-ripe cuttings now so you can root a replacement. I snip 3- to 4-inch nonflowering shoots, strip the bottom inch of leaves, and tuck them into a small pot filled with a gritty mix of half potting soil and half perlite or coarse sand.

Keep the cuttings in bright shade, not hot direct sun, and water just enough to keep the mix barely moist. In warm weather, many lavender cuttings begin rooting in 3 to 6 weeks. I usually start 6 to 8 cuttings if I need only 2 plants, because not all of them take. It is a simple way to keep a favorite variety going, and it feels especially nice if a plant came from a friend or has been in your garden for years.

11. Reshape the planting area so fall light reaches the plant

By August, a lot of summer gardens are taller and shadier than they were in May. Lavender needs plenty of sun to rebound well, ideally 6 to 8 hours a day. If annuals, tomato cages, sprawling zinnias, or even porch containers are casting shade over the plant, move what you can. Fall growth will be much sturdier if the plant gets solid afternoon light and dries quickly after dew or rain.

In my backyard, I once had a lavender mound half-hidden behind a big late-summer pot of petunias and sweet potato vine. It looked terrible until I shifted the container 3 feet over. Within two weeks, the lavender had better color and firmer new shoots. Sometimes rejuvenation is less about heroic pruning and more about making sure the plant is not competing with your whole August jungle.

12. Time your August work so new growth can harden off before frost

Late-summer pruning should happen early enough that the plant can respond, but not so late that you force tender new growth right before cold weather. In colder parts of the Midwest, I like to do the main August trim in the first half of the month, or by about August 15 to 20 at the latest. In milder areas, you may have a little more flexibility. The farther north you are, the more careful you need to be.

If your average first frost comes in early October, avoid heavy trimming at the end of August or in September. You want enough time for fresh shoots to firm up. A light deadhead later is fine, but save major shaping for earlier in the month. Garden timing matters almost as much as the cut itself.

13. Make a plan for fall and next spring so the woodiness does not return as quickly

August care can help a lot, but long-term success comes from consistent shaping year after year. Once your lavender finishes its main bloom next season, trim it back lightly again before it gets rangy. The basic habit I follow is a modest shaping after flowering and a careful cleanup in late summer if needed. That keeps the plant compact and slows the spread of bare wood.

If a plant is more than 5 to 7 years old and has a thick woody base wider than your wrist with sparse green growth only on the tips, I start planning a phased replacement. I may keep the old shrub for one more year while growing rooted cuttings nearby. That way the garden never looks empty, and I am not trying to squeeze another three years out of a plant that has already given me its best.

14. Use the trimmed lavender so the chore feels rewarding

I always think garden jobs are easier to keep up with when they lead to something pleasant for the household. Freshly trimmed lavender can be bundled for drawers, tucked into little sachets, or dried for simple table arrangements. Sometimes I put a few stems in a jar near the kitchen sink just because they make the room feel calm after a busy day.

If you have children or grandkids around, this is also a sweet, low-mess garden task to share. Let them strip dried buds into a bowl or tie bundles with ribbon. It turns pruning day into something a little special instead of just another item on the chore list. And honestly, anything that makes August yard work feel less like drudgery is a win in my book.