Curling leaves on a tomato plant?

Tomato leaves curling usually means the plant is under stress from heat, uneven moisture, damaged roots, pests, virus, or spray drift.

Answer what you can see

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Push a finger two inches into the soil. What does it feel like?

Which leaves are affected?

What has the weather been doing?

How fast did this happen?

Some answer sets overlap: dry soil plus heat can be heat stress, pests, or virus, and damp soil plus twisted newest growth over a week can be pests, virus, or herbicide drift. Use the close-up checks: insects or webbing point to pests, narrow fern-like new growth points to herbicide, yellow stunted new growth points to virus, and simple upward rolling with dry soil points to heat and moisture stress.

The causes in full

Heat and dry-soil stressMOST COMMON

How to tell
Check whether the curl is mostly upward rolling on lower or sun-exposed leaves while the soil is dry two inches down, especially during hot afternoons.

What to do
If the soil is dry two inches down or baked hard and cracked, water deeply at the soil line until the root zone is moist, then add mulch to slow drying. During extreme heat, use temporary afternoon shade cloth if possible, but keep tomatoes in full sun overall.

Waterlogged roots after rain or overwateringCOMMON

How to tell
Push into the soil and look for soil that stays wet, smells sour, or leaves lower leaves curled, limp, yellowing, or drooping after rain.

What to do
If the soil is waterlogged two inches down, withhold irrigation until it feels only damp rather than wet. Pull mulch back for a few days, open channels so rain can drain away, and water later only when the soil is starting to dry two inches down.

Cold snap or late frost stressCOMMON

How to tell
Look for curling that showed up right after a cold night, with dull, dark, limp, or water-soaked-looking leaf tips and outer leaves.

What to do
Leave damaged leaves on until you can see what is still growing, then trim only dead tissue. Cover plants before the next cold night and avoid heavy feeding until new growth is steady again.

Aphids, whiteflies, or spider mitesCOMMON

How to tell
Turn over curled leaves and look for clusters of tiny insects, white flying specks, fine webbing, sticky residue, or pale speckling on leaves.

What to do
If you find pests, knock them off with a firm hose stream, repeat every few days, and treat heavy infestations with insecticidal soap or horticultural oil labeled for tomatoes. Focus on leaf undersides and avoid spraying during the hottest part of the day.

Herbicide drift or weed-killer spray damageLESS COMMON

How to tell
Look for very narrow, twisted, fern-like new leaves, curled tips, and damage strongest on the side facing a lawn, path, fence line, or recently sprayed area.

What to do
If weed killer or lawn spray may have drifted onto the plant, stop any further exposure and do not add extra fertilizer to force growth. Wait one to two weeks; if new growth comes out normal, keep the plant, but remove badly distorted shoots that do not recover.

Tomato yellow leaf curl virus or curly top virusRARE

How to tell
Suspect virus when the newest leaves stay small, yellow, cupped, and twisted, the plant is stunted, and nearby tomatoes show the same pattern even though soil moisture is reasonable.

What to do
There is no cure for a virus-infected tomato plant; remove severely stunted plants so they do not keep attracting and feeding insect carriers. Control whiteflies and leafhoppers, clear nearby weeds, and use row cover on young plants before pests arrive.

Will it recover?

Leaves curled from heat or dry soil may partly flatten after the plant is rehydrated and the weather eases, but leaves damaged by cold, herbicide, pests, or virus often stay distorted, so judge recovery by healthy new growth.

Stopping it happening again

Keep tomatoes evenly moist by watering deeply when the soil is dry two inches down, mulch the bed, improve drainage before storm season, protect from late cold, avoid spraying weed killers near the garden, and check leaf undersides weekly for pests.