Summer in the Mid-South means heat, humidity, and sudden dry spells. That combination can push even an established landscape to its limits. The good news is that a few well-timed habits make all the difference between plants that merely survive and plants that thrive from June through August. Here is how to keep your lawn, beds, and containers healthy through the hottest months of the year.
Summer Watering and Irrigation
When the heat sets in, hydration becomes the single most important thing you do in the garden. Intense sun, drying winds, and the occasional dry spell mean water demand can spike quickly, and the plants most at risk are the ones you put in the ground most recently.
- Hand-water new plants. Do not rely on automatic irrigation alone for trees and shrubs during their first growing season. A new plant’s roots are still confined to the size of its original container, so a standard irrigation system may deliver as little as 13% of the water that plant actually needs. Hand-watering directly over the root ball makes up the difference.
- Check containers and hanging baskets often. Heat and wind dry pots out fast, sometimes more than once a day. The simplest test is to pick the pot up: if it feels unusually light, it needs a deep soak.
- Use soaker hoses and a timer. For established beds, soaker hoses water slowly and efficiently right at the soil. A simple timer on the faucet lets you water deeply without the risk of leaving the hose running overnight.
- Watch your thirsty specimens. SunPatiens tolerate full sun but drink far more than shade-grown varieties. Aquatic plants are heavier users still; a large lotus can lose up to four inches of water from its pot in a single hot day.
Lawn Care and Mowing
How you mow in summer matters as much as how often. Proper mowing height protects both the soil and the grass roots from heat stress.
- Raise the mower. Set your wheels higher during hot weather to keep grass taller: roughly 2 to 3 inches for Zoysia and Bermuda, and 3 to 4 inches for Fescue. Taller grass shades the soil, slows evaporation, and helps the lawn crowd out weeds.
- Follow the one-third rule. Never remove more than one-third of the grass blade in a single mowing. Taking off more invites the “Sunday morning browning” that comes from heat stress.
- Fertilize with discipline. Keep feeding Bermuda monthly through the summer. Fescue is the opposite. Stop fertilizing it in the heat, because it is trying to go dormant. Instead, spray it with seaweed twice a month to help it ride out the drought.
Summer Pruning and Deadheading
A little maintenance now keeps plants vigorous through the season and sets them up to come through winter safely.
- Finish evergreen pruning by July 1st. Complete any heavy pruning of hollies, boxwoods, and other evergreens before the first of July. Pruning later pushes out tender new growth that will not have time to harden off before the first freeze, which leads to serious winter damage.
- Pinch caladium blooms. If your caladiums send up “rocket” bloom spikes, pinch them out right away. Letting them go to seed steers energy away from the colorful foliage that is the whole reason to grow them.
- Keep herbs productive. Cut back the bloom spikes on basil, parsley, and other herbs to stop them from going to seed and keep the leaves coming.
- Refresh spirea. Sun-loving spirea can be cut all the way to the ground about every five years to bring on a fresh flush of growth.
Managing Summer Pests and Fungal Diseases
Heat and humidity turn the garden into a petri dish for a handful of predictable summer problems. Knowing what to watch for is half the battle.
- Japanese beetles. These metallic beetles show up in early summer and love to congregate on roses and crape myrtles. Traps work, but set them well away from your prized plants so you are not drawing beetles toward them. If you need to spray, do it at dusk to protect pollinators.
- Spider mites. These thrive in hot, dry weather and leave fine webbing on plants like burning bush and eucalyptus. A strong blast of water from the hose is often the most effective way to knock them off.
- Mosquitoes. Treat standing water in birdbaths and ponds with Altosid or BTi bacteria (sold as Mosquito Bits). Both kill the larvae without harming fish or pets.
- Powdery mildew. Common on sage and spirea, this fungus does not need moisture to spread and can show up even during a dry spell. Open the plant up with selective pruning to improve air circulation and slow it down.
- Vinca wilt. Periwinkle (Vinca) is prone to water-mold pathogens when it stays too wet. Avoid overwatering and make sure the bed drains well to prevent a sudden collapse.
Reliable Summer Bloomers
For dependable color that shrugs off the heat, these local favorites earn their place in a Mid-South garden.
- Vitex (Chaste Tree). A tough, summer-blooming small tree whose purple flower spikes are a magnet for bumblebees.
- Althea (Rose of Sharon). A nearly foolproof hibiscus relative that blooms all summer and can be trained into a hedge or a small tree.
- Sun-tolerant hydrangeas. Old-fashioned mopheads need shade, but Paniculata varieties like ‘Limelight’ love all the sun you can give them and bloom reliably right through summer.
Stay on top of watering, mow high, finish your evergreen pruning by July, and keep an eye out for the season’s usual pests, and your garden will not just survive a Mid-South summer. It will look its best straight through to fall.