Tomato leaves curl for many reasons, and not all of them are serious. Heat, drought, heavy pruning, transplant shock, and inconsistent watering can cause physiological leaf roll. Herbicide drift, virus disease, mites, and root damage can cause more severe curling and distortion.
The shape of the curl matters. Rolled older leaves are different from twisted, fern-like, distorted new growth.
For fertilizer and calcium context, read Best Fertilizer for Tomatoes.
Last updated: June 6, 2026.
Quick Answer
If tomato leaves curl upward but plants otherwise look healthy, check heat, watering, mulch, and pruning first. If new growth is twisted, narrow, cupped, yellow, or stunted, suspect herbicide injury, virus disease, mites, or serious root stress.
Tomato Leaf Curl Diagnosis
| Symptom | Likely cause |
|---|---|
| older leaves roll upward | heat, drought, physiological leaf roll |
| whole plant wilts and curls | water stress or root issue |
| new growth twisted and narrow | herbicide drift or residue |
| leaves curled with yellow mosaic | virus possibility |
| tiny speckling and webbing | mites |
| lower leaves curl after pruning | stress response |
Physiological Leaf Roll
This is common and often not fatal. It can happen when plants face:
- hot weather
- dry soil
- wet-dry watering swings
- heavy pruning
- root restriction
- fast growth
- transplant stress
Fix the growing conditions. Do not spray pesticides for physiological leaf roll.
Water and Heat Fixes
Use:
- deep watering
- mulch after soil warms
- drip irrigation
- consistent schedule
- shade cloth during extreme heat if needed
- less aggressive pruning
Avoid daily shallow watering. It encourages shallow roots and stress.
Herbicide Drift or Residue
Herbicide injury often causes twisted, narrow, strap-like, or cupped new growth. It may come from:
- lawn weed killer drift
- contaminated compost
- treated grass clippings
- sprayer residue
- manure or hay with persistent herbicides
If herbicide injury is likely, do not compost affected plant material. Review all inputs.
Virus or Pest Problems
Virus symptoms can include:
- yellowing
- mosaic pattern
- severe stunting
- curling new growth
- poor fruit set
Mites can cause curling, bronzing, and fine webbing. Use a hand lens to inspect undersides of leaves.
FAQ
Should I remove curled tomato leaves?
Remove diseased or badly damaged leaves, but do not strip healthy curled leaves just because they are curled.
Can tomatoes recover from leaf curl?
They can recover from stress-related curling if conditions improve. Virus or severe herbicide injury may not recover.
Does leaf curl mean tomatoes need fertilizer?
Usually no. Diagnose watering, heat, roots, pests, disease, and herbicide exposure before fertilizing.
Related Reading
- Tomato Blossom End Rot Treatment
- Why Tomato Plants Need Calcium
- How Often to Water Tomatoes in Raised Beds
- Best Tomato Cages for Heavy Plants