My tomatoes wilt every afternoon in hot weather — is something wrong?
Midday wilt on hot days is often a normal, temporary response to heat load — if plants recover by evening, the roots are functioning and the wilting is a water conservation mechanism, not distress.
Tomato leaves wilt in the heat of the afternoon when water loss through transpiration exceeds the rate at which roots can supply water. This can happen even in a well-watered plant during very hot, sunny conditions. If you check the plants in the evening — after 5 or 6 PM when solar radiation has dropped — and the leaves have recovered, the root system is doing its job. This is a normal physiological response, not a sign of disease or failure.
The concern is a plant that hasn't recovered by the next morning. If tomatoes are wilted at 8 AM in a bed that was watered the previous day, something beyond heat is happening. Possibilities include: soil that is too dry (check with a finger 3–4 inches deep), root damage from disease or root-knot nematodes, cutworm damage at the base (check the stem at soil level), or Fusarium or Verticillium wilt — soilborne fungal diseases that block water movement inside the stem.
To distinguish heat wilt from disease wilt, check the timing. Heat wilt follows predictable hot-afternoon patterns and recovers overnight. Disease wilt can appear at any time of day, often progresses up the plant from lower leaves, and doesn't recover with watering. If you cut a wilted stem and look at the cross-section, Fusarium and Verticillium wilt often shows brown discoloration in the vascular tissue — a sign the problem is in the stem, not the soil.
Mulch is the most effective intervention for heat-related wilt. A 2–3 inch mulch layer keeps soil temperatures lower and maintains soil moisture more consistently, reducing the conditions that cause repeated wilt.
- TomatoThe warm-season anchor of the summer garden.
- PepperA tropical perennial grown as an annual — patient, slow, and particular about warmth.
- CucumberA thirsty vine that wants warm soil, steady water, and something to climb.
- BasilThe summer companion — to tomatoes, to pasta, and to the gardener with a south-facing window.
- Blossom DropFlowers fall before setting fruit, often during temperature extremes or after weather stress.
- Brown Marmorated Stink BugSunken, corky dimples on fruit and pods caused by a mottled brown shield bug feeding through the skin.
- Cabbage MaggotBrassica transplants wilting and dying as white maggots tunnel through roots at or below the soil line.
- Carrot Rust FlyRusty tunnels through carrot and parsnip roots made by small white maggots feeding inside the root.
- ClubrootBrassica plants wilt and yellow despite watering; roots show club-shaped swellings when dug.
- My tomato plants are full of flowers but no fruit is setting — why?Tomato flowers drop without setting fruit when night temperatures stay above 70°F or below 55°F — heat at night is the most common cause in mid-summer.
- We're in a drought — how do I keep my garden going?Mulch, deep infrequent watering, and cutting back on what you're growing are the three adjustments that make the biggest difference during drought conditions.
- What is that black leathery patch on the bottom of my tomatoes?Blossom end rot is a calcium deficiency at the fruit level, almost always caused by irregular watering rather than a lack of calcium in the soil.