If your crape myrtle looked glorious in June and July but now seems to be running out of steam, August is the month that decides what happens next. I garden in hot, humid summers where crape myrtles earn their keep, and I can tell you from experience that a little timely attention right now can mean the difference between tired seed heads and a fresh flush of flowers that carries the garden well into early fall.

The trick is not doing more so much as doing the right things at the right time. In August, I focus on moisture, light feeding, careful pruning, and stress reduction. Below are 10 essential jobs I tackle on my own crape myrtles this month to encourage repeat blooming without pushing the plants into weak, late-season growth.

1. Remove spent flower clusters before they set seed

The single most effective August task is deadheading the faded flower panicles. Once those big bloom clusters turn brown and begin forming seed capsules, the plant shifts energy away from producing more flowers. I snip off the entire spent cluster, cutting just above a pair of leaves or a side shoot.

Use clean, sharp hand pruners for stems up to about 1/2 inch thick. On taller shrubs, lightweight loppers help reach the upper clusters safely. I try to do this every 7 to 10 days in August, especially after a major flush finishes. On vigorous modern varieties, that simple cleanup often triggers new shoots and buds within 2 to 3 weeks.

2. Water deeply, not lightly, during late-summer heat

Crape myrtles are drought tolerant once established, but “drought tolerant” does not mean “best blooming while parched.” In August, heat and dry soil can stall rebloom. I aim to give established plants roughly 1 inch of water per week, either from rain or irrigation, and up to 1 1/2 inches during stretches above 95°F.

For a shrub-sized plant, that usually means a slow soak with 8 to 12 gallons once a week rather than a quick daily sprinkle. For young trees planted within the past 12 to 18 months, I check soil more often and may water every 3 to 4 days in sandy ground. The goal is moist soil 6 to 8 inches deep, not soggy roots.

3. Refresh mulch, but keep it away from the trunk

A proper mulch layer can stabilize soil temperature, reduce evaporation, and make your watering far more effective. By August, mulch often has thinned or broken down, especially after summer storms. I top it up to a depth of 2 to 3 inches using shredded bark, pine straw, or leaf mold.

Keep mulch at least 3 to 4 inches away from the base of the trunk. I never pile it into a “mulch volcano.” That traps moisture against the bark, encourages disease, and can lead to rot or insect problems. A flat, wide mulch ring extending out to the drip line is much better than a deep mound at the base.

4. Feed lightly with a low-dose, balanced fertilizer if the plant is hungry

August is not the time for heavy feeding, but a modest application can help a nutrient-starved crape myrtle push a second bloom cycle. If the foliage looks pale, growth is weak, or the plant has been flowering hard for months in lean soil, I use a light dose of balanced fertilizer such as 5-5-5 or 10-10-10.

For an established shrub, that may be just 1/4 to 1/2 cup scattered around the root zone, not pressed against the trunk, then watered in well. For larger tree forms, I follow the label rate carefully and usually stay on the low side in late summer. Avoid high-nitrogen lawn fertilizers near the root area; they can give you lots of leaves and long shoots but fewer flowers.

5. Skip hard pruning and only make strategic cuts

If you want more blooms, resist the urge to hack the plant back. August is for precision, not “crape murder.” Severe cuts now waste stored energy and can produce coarse, awkward growth instead of a graceful repeat show.

I limit myself to three kinds of cuts: removing spent blooms, taking out dead or broken twigs, and thinning a few crossing shoots if air circulation is poor. Any cut larger than about 1 inch across can wait until the dormant season. This lighter approach preserves the plant’s shape and keeps bloom-producing wood in place.

6. Remove root suckers and water sprouts

Many crape myrtles send up suckers from the base or produce fast, vertical shoots along branches after stress or earlier pruning. In August, these stems steal energy that could go into flowers. I rub off tiny new shoots by hand or clip them cleanly at their point of origin.

This matters most on tree-form crape myrtles where you want energy directed into the canopy. I inspect the base every couple of weeks. If you let suckers grow unchecked for a full season, they become woody, harder to remove, and more likely to distort the plant’s shape.

7. Check for powdery mildew, aphids, and sooty mold

Repeat blooming depends on healthy leaves. If the foliage is coated with white powdery mildew, curled from aphid feeding, or blackened with sooty mold, the plant cannot photosynthesize efficiently enough to support another heavy bloom set.

I inspect both the upper and lower surfaces of leaves, especially in dense canopies with limited airflow. Aphids are often clustered on tender shoot tips and underneath leaves. A strong blast of water from the hose in the morning can knock many of them off. If pressure is severe, insecticidal soap works well when sprayed thoroughly according to label directions. For mildew, improving airflow and avoiding overhead watering late in the day helps more than anything.

8. Open up crowded growth so light reaches developing shoots

Crape myrtles bloom best in full sun, and by August, nearby perennials, annual vines, or overgrown shrubs may be shading the lower or inner branches more than you realize. I look at the plant around midday. If it is getting less than 6 hours of direct sun, rebloom will usually be reduced.

You may not be able to move the crape myrtle, but you can often reclaim light by cutting back encroaching plants. I have improved flowering just by pulling a vigorous morning glory off the canopy and trimming a neighboring shrub by 12 to 18 inches. More light means stronger new shoots, and those shoots are where the next flower clusters form.

9. Keep the root zone free of lawn competition

One mistake I see often is turfgrass growing right up to the trunk. Grass is greedy. It competes for water and nutrients exactly where crape myrtle feeder roots are active. In August, that competition becomes more intense because both lawn and shrub are under heat stress.

I like a mulch circle at least 3 feet across for smaller specimens and 5 to 6 feet across for mature trees if space allows. That root-zone buffer reduces mower damage too. You would be surprised how many crape myrtles perk up once they are no longer battling bermuda or fescue at the base.

10. Time your final grooming early enough for buds to form

If you want a second wave of blooms, do not wait until the very end of August to start. In many climates, the sweet spot is early to mid-August, because the plant needs time to push new growth, set buds, and open flowers before cooler nights arrive.

On my own plants, deadheading around the first or second week of August gives the best chance of seeing color again by late August through September. If you are in a warmer Zone 8 or 9 garden, you may have a longer window. In cooler parts of Zone 6 or 7, every week matters, and delayed cleanup often produces buds that never fully open.

11. Avoid overwatering after rainstorms

August can bring wild weather swings: one week bone dry, the next week torrential rain. If your soil already received 1 to 2 inches of rain, hold off on supplemental irrigation until you check moisture below the surface. I use a trowel or even a long screwdriver to test the soil 4 to 6 inches down.

Roots that stay constantly waterlogged are more prone to stress, yellowing foliage, and reduced flowering. Crape myrtles like drainage. In clay soil, that matters even more. If water puddles around the base for more than 24 hours after a storm, consider lightly cultivating the outer soil surface and making sure mulch is not packed too tightly.

12. Make note of varieties that naturally rebloom best

Not every crape myrtle performs the same way, and I think this is worth saying plainly. Some cultivars are naturally better repeat bloomers than others, even with perfect care. If one plant in your yard always gives a strong encore and another never does, genetics may be part of the story.

Keep notes this August: when you deadheaded, how much rain fell, whether pests were present, and how quickly buds returned. That little garden record helps you spot patterns. Over time, you will know which plants respond to deadheading, which need extra water in heat, and which are simply one-and-done bloomers. That kind of observation has saved me more time than any fertilizer or gadget ever has.

13. Leave enough healthy foliage to power the next bloom cycle

It is tempting to keep tidying and clipping until the plant looks ultra-neat, but leaves are the engine that fuels new buds. Every green leaf is helping manufacture the energy needed for a second show. When I deadhead, I am careful to remove only the faded cluster and the smallest amount of stem necessary.

If a branch is leafy, healthy, and well placed, I leave it alone. The fuller the healthy canopy, the better the odds of a strong late-season performance. Think of August care as supportive coaching, not a makeover.

14. Be realistic about what “second bloom” looks like

Even with excellent care, the second wave is often lighter than the first. That is normal. I usually expect 30% to 70% of the early-summer display, depending on variety, age, weather, and how quickly I removed spent flowers. A mature plant in full sun with steady moisture may surprise you with more, but a smaller encore is still a success.

What matters is extending the season. A fresh scattering of magenta, white, lavender, or red blooms in late August and September can make the whole garden feel revived. And from a practical standpoint, those flowers support pollinators at a time when many early summer shrubs are already finished.