Keeping Your Garden Alive Through a Heat Wave
A real-talk guide to getting your plants, vegetables, and flowers through the hottest stretch of summer
Y’all, if your garden is looking a little tired right now, you are not alone. Between the farm and our own flower beds, Lane and I have been out here every morning this week trying to keep things alive in this heat, and I’ll be honest, some of it is just trial and error.
Here’s the thing nobody tells you: a wilted plant in the middle of a hot afternoon usually isn’t an emergency. It’s a plant doing exactly what it’s supposed to do to protect itself. The real skill in a heat wave isn’t doing more, it’s knowing when to hold back. So I pulled together everything we’ve learned over the years, the do’s, the don’ts, and a few tricks that have saved more than one hanging basket around here.
Now let’s get your garden through this. — Jules
Watering, Done Right
Most important- Water deeply, early. Get to your garden before 9am if you can. A slow, deep soak before the sun climbs lets roots actually absorb the water before it evaporates.
- Check before you add a second watering. Don’t water twice just because it’s hot. Stick a finger two to three inches into the soil first. If it’s still cool and moist down there, hold off, even if the leaves look droopy.
- If you do water again, do it in the evening, after 6pm. Avoid midday watering on hot soil. It can shock the roots more than help them.
- Water the soil, not the leaves. Wet foliage in direct sun can scorch, and it doesn’t actually help the roots much anyway.
- Lift your pots. A dry pot is noticeably lighter than a well-watered one. Once you get a feel for it, it’s faster than checking soil every time.
The Bucket Soak (for hanging baskets and dried-out pots)
When a hanging basket or pot has gone so dry that water just runs straight through without soaking in, top watering won’t fix it. The soil has actually pulled away from the sides of the pot.
Instead, fill a large bucket or basin with water and submerge the whole pot, rootball and all, until the bubbles stop rising. That usually takes five to ten minutes for a hanging basket, a bit longer for bigger pots. Let it drain completely before you rehang it or set it back down. Sitting in standing water afterward invites root rot just as fast as drying out did.
Works especially well for: hanging baskets, window boxes, terracotta pots, and anything that’s gone bone-dry.
What Not to Do Right Now
- Don’t fertilize. Heat-stressed plants can’t process nutrients well, and fertilizer salts can burn roots that are already under stress. Wait for cooler weather.
- Don’t prune. Cutting back stresses a plant further and removes leaves it needs for shade and moisture regulation. Deadheading spent blooms is fine. Heavier pruning can wait.
- Don’t transplant or repot if you can help it. Save that for a cooler stretch.
- Don’t mistake afternoon wilting for a watering emergency. If it perks back up by evening, that’s a normal heat response, not a crisis.
Shade, Mulch & Setup
- Mulch heavily, two to three inches of straw, shredded bark, or grass clippings. Keep it an inch or two away from stems so you’re not trapping moisture against them. Good mulch can drop soil temperature by 10 to 15 degrees.
- Use shade cloth or an old bedsheet over vulnerable beds during the worst afternoon hours, roughly 1 to 4pm. Pull it back off by evening so plants still get morning and evening light.
- Group your containers together. Potted plants clustered close create a shared microclimate and shade each other’s pots, keeping roots cooler than one pot baking alone.
- Set pots on a tray of pebbles with a little water in the bottom (not touching the pot base) for extra humidity without waterlogging the roots.
- A light morning mist can help humidity-loving plants, but skip it at midday. Water droplets in direct sun can act like little magnifying glasses on some leaves.
🥒 For the Vegetable Garden
- Tomatoes, peppers, and other fruiting vegetables may drop blossoms once it climbs above about 90°F. That’s normal heat response, not something you did wrong.
- Harvest a little earlier than usual. Heat speeds up bolting in lettuce, spinach, and other leafy greens.
- Mulch around the base of fruiting plants extra thick since they’re working hardest right now.
🌸 For Flowers & Annuals
- Annuals in pots dry out fastest of anything in the garden. Check those daily, even if you’re not checking anything else.
- Deadhead spent blooms to keep plants tidy, but save the heavier pruning for cooler weather.
- Cutting flowers for the house? Cut in early morning when stems are most hydrated, and get them in water right away.