Tomato Leaves Curling?
The four common causes — and how to tell which one you have.
Curling tomato leaves are most often harmless physiological leaf roll from heat, wind, or pruning — but tight, twisted new growth can mean herbicide drift, broad mites, or tomato yellow leaf curl virus. The pattern tells you which: even upward roll on a healthy plant is stress; distorted, yellowing new leaves with stunting point to virus or chemical damage. Snap a photo below for an instant diagnosis and the exact fix.
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The 4 causes, compared
| Cause | How to spot it | Fix |
|---|---|---|
| Heat & wind stress (leaf roll) | Lower leaves roll upward, plant otherwise healthy, worst in a heatwave | Shade in peak sun and water consistently — it's harmless, no spray needed |
| Herbicide drift | New growth twisted, cupped, narrow and fern-like | Remove the exposure source; badly hit plants rarely recover |
| Broad mites / aphids | Newest leaves curled, sticky or distorted at the tips | Spray insecticidal soap or sulfur; check leaf undersides |
| Tomato yellow leaf curl virus | Small upward-cupped leaves with yellow edges + stunting, whiteflies present | Remove and bin the plant; control whiteflies to protect the rest |
FAQ
- Why are my tomato leaves curling up but still green?
- Even, upward curling on a healthy green plant is usually physiological leaf roll from heat, wind, or heavy pruning. It's the plant protecting itself from moisture loss — it's harmless and fruit sets normally.
- Will curled tomato leaves recover?
- Heat- and water-stress curl un-rolls once conditions steady. Herbicide or virus curl usually won't reverse — healthy new growth is the sign the problem has passed.
- How do I tell leaf roll apart from a virus?
- Leaf roll is even and green with an otherwise healthy plant. Virus curl adds yellowing, small distorted new leaves, and stunting — and you'll often spot whiteflies underneath.