5. Feed lightly, not heavily
One of the easiest ways to get lots of leaves and fewer flowers is to overfeed lantana in late summer. If your plant is pale, slowing down, or in a container that has been watered constantly for months, a light feeding can help.
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But August is not the time for a heavy blast of high-nitrogen fertilizer.
I use a balanced or bloom-supporting fertilizer at half strength, something like a 5-10-5 or 10-10-10 diluted according to label directions. For liquid feed, once every 2 to 3 weeks in August is plenty. For granular products, I apply sparingly and water in well.
If your lantana is planted in the ground and already blooming strongly with healthy green foliage, you may not need fertilizer at all. In my experience, potted lantana benefits more from a light August feeding because nutrients leach out faster with regular watering.
6. Refresh mulch, but keep it away from the crown
When late-summer heat settles in, a 2-inch layer of mulch makes a real difference. I use shredded hardwood mulch or clean straw around in-ground lantana to hold moisture, reduce temperature swings, and keep the root zone from baking.
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It also cuts down on weed competition, which matters more than people think when a plant is trying to keep blooming hard through September.
I always keep mulch 2 to 3 inches away from the main stems. Piling it against the crown can trap moisture where you don’t want it and increase the odds of rot, especially if nights are humid.
The goal is insulation, not a damp collar around the base of the plant.
In containers, I don’t mulch heavily, but I sometimes add a very thin top layer of fine bark to slow evaporation. It helps most on terra-cotta pots, which dry out faster than plastic or glazed ceramic.
7. Watch for whiteflies, spider mites, and lace bugs
August is prime time for pest flare-ups because heat-stressed plants are easier targets. On lantana, I check the undersides of leaves for whiteflies, stippling from spider mites, and general leaf yellowing or speckling.
If I brush the plant and a tiny cloud of white insects lifts off, that’s my clue to act quickly.
Spider mites are especially sneaky in hot, dry weather. You might notice leaves looking dusty, faded, or finely speckled before you ever see webbing.
Lace bug feeding can also leave foliage looking bleached or stippled. Any of these pests can reduce blooming by weakening the plant.
My first line of defense is a strong spray of water early in the day, aimed at the leaf undersides. If that’s not enough, I use insecticidal soap according to label directions and repeat as needed, usually every 5 to 7 days for a couple of rounds.
I avoid spraying in the heat of the afternoon when temperatures are above about 85 degrees, because foliage burn becomes more likely.
8. Remove damaged, crowded, or crossing stems
Besides trimming for shape, I also thin out stems that are obviously damaged, broken, rubbing together, or clogging the center of the plant. Good airflow matters a lot in muggy late summer weather.
A crowded lantana can stay damp longer after rain or watering, and that opens the door to stress and disease issues.
I usually remove just a few stems per plant, enough that I can see light and air moving through the middle. Think of it like editing, not hacking.
If the plant has one branch sprawling 12 inches beyond the rest, I cut it back. If two stems are crossing and scraping each other, one goes. This keeps the plant neat and encourages more even blooming.
9. Move container lantana if the light has changed
This one surprises people, but by August the sun angle has shifted enough that a spot that was “full sun” in June may now be getting blocked for part of the day by trees, fences, or even the house.
Lantana blooms best with at least 6 hours of direct sun, and 8 or more is even better.
If your potted lantana has slowed down and everything else seems fine, try relocating it to a brighter spot for a week. I’ve had containers near my garage go from average to loaded with buds just by moving them 8 or 10 feet into clearer afternoon sun.
Since containers are portable, this is one of the easiest fixes you can make.
For in-ground plants, you obviously cannot move them now, but you can trim nearby annuals or temporary growth that may be shading them more than earlier in the season.
10. Don’t let weeds and neighboring plants steal water and airflow
August weeds are aggressive, and they compete directly with lantana for moisture and nutrients. I make it a point to clear a weed-free circle at least 12 to 18 inches around each in-ground plant.
If lantana is packed too tightly with petunias, coleus, sweet potato vine, or other summer fillers, I thin those companions too.
I learned this the hard way in one of my driveway beds. I had lantana mixed with a very enthusiastic annual vine, and by mid-August the lantana was blooming less even though I was watering regularly.
Once I cut back the vine and pulled weeds, the lantana rebounded within about 10 days. Sometimes the problem is not the lantana itself. It’s the crowd around it.
11. Skip heavy late-season pruning that forces too much tender growth
There’s a sweet spot with August pruning. A moderate trim encourages branching and fresh flowers, but a severe cut can backfire, especially if you’re in a region where frost may arrive in 6 to 10 weeks.
If you cut the whole plant way down, it may spend precious time rebuilding stems instead of blooming.
I avoid removing more than about one-third of the plant at once this late in the season. That gives me the refresh I want without sacrificing the show.
If a plant is truly a mess, I’ll spread pruning over two sessions about 10 to 14 days apart rather than shocking it all at once.
12. Plan now for the first cool nights and the end-of-season stretch
If you want blooms until frost, August is when you set up September success. Keep deadheading, keep watering deeply, and keep feeding very lightly if needed through early fall.
As nights cool into the 50s, blooming may actually improve for a while if the plant has stayed healthy through peak summer heat.
For container lantana you hope to overwinter, now is also the time to decide whether you’ll bring it in before temperatures drop below about 40 to 45 degrees.
A healthier, well-maintained plant transitions indoors much better than one that has been ignored all August. Even if you treat it as an annual, the same care keeps it attractive much longer.
My basic August-to-frost routine is simple: deadhead weekly, check soil moisture every day in pots, trim lightly every couple of weeks as needed, and inspect for pests whenever I water.
It sounds like a lot written out, but in real life it’s 10 minutes here, 5 minutes there. And that little bit of attention is exactly what keeps lantana covered in those cheerful clusters when so many other summer flowers are already fading out.
