Tomato: leaves rolling or curling inwards

What it is likely to be on tomato

1. Physiological leaf roll

   May be normalvery common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Tomato leaf roll

   Checked 2026-08-13

   Tomato leaves rolling upwards and inwards along their length, firm and green rather than distorted or discoloured. It is a water-conservation response to heat, irregular watering or heavy pruning, it does not reduce the crop, and it is very commonly mistaken for a virus — which is the reason it matters, because the response to a suspected virus is to destroy the plant.

   Points towards it

   • · a water-conservation response affects the whole plant rather than a patch
   • · heat is the commonest trigger for the rolling response
   • · the response shows across established leaves rather than only the newest

   Argues against it

   • · a pest is present, and physiological rolling involves no organism. Curling with insects inside it is aphid damage — this rules it out entirely.
   • · mottling or a mosaic pattern alongside the rolling points away from a simple water response

   Check this next

   Look at the rolled leaves rather than the rolling. Firm, evenly green leaves with normal new growth and unaffected fruit is the physiological response and needs no treatment; thin, mottled or distorted leaves are a different question entirely.

   What to do now

   Steady the watering and ventilate in hot weather. No treatment is needed: this does not reduce the crop, and it is very commonly mistaken for a virus — which matters, because the response to a suspected virus is to destroy the plant.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Tomato leaf roll

   Checked 2026-08-13

2. Underwatering

   Candidate 2common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Watering

   Checked 2026-08-13

   Easier to correct than overwatering and easily confused with it, because a plant short of water and a plant drowning both wilt. The distinguishing observation is not the plant at all — it is the compost, and it takes two seconds to check.

   Points towards it

   • · the compost is dry, which is what this cause requires
   • · a plant short of water is short of it everywhere

   Argues against it

   • · the compost is wet, so the plant is not short of water at the root — this rules it out entirely.

   Check this next

   Push a finger deep into the compost and lift the pot. Dry at depth and light to lift means underwatering; the leaves should recover within a few hours of a thorough soak, which physiological rolling does not.

   What to do now

   Water thoroughly until it runs from the base, then water evenly rather than heavily and occasionally. Swings between wet and dry cause more rolling than a steady deficit does.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Watering

   Checked 2026-08-13

3. Aphids

   Candidate 3common on this plant

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Aphids

   Checked 2026-08-13

   Sap-feeding insects that cluster on soft growing tips and leaf undersides, distorting new growth and leaving sticky honeydew that blackens with sooty mould. Most garden infestations are transient and end when predators catch up.

   Points towards it

   • · colonies or honeydew confirm sap-feeding rather than a water response
   • · aphids feed on the softest tissue, so the curling is at the tips

   Argues against it

   • · no pest can be found, and aphid curling is normally accompanied by visible colonies

   Check this next

   Unroll a curled tip and look inside it. Aphids shelter within the curl, so a tip that looks clean from outside may not be — and a genuinely clean tip points away from aphids.

   What to do now

   Wash the colonies off the growing tips with a jet of water and check again after a few days.

   ·source

   Sourced guidancehigh confidence

   • Royal Horticultural Society: Aphids — control

   Checked 2026-08-13

4. Heat stress

   Candidate 4common on this plant

   ·source

   Sourced guidancemoderate confidence

   • Royal Horticultural Society: Heat and drought stress

   Checked 2026-08-13

   The response of a plant whose water loss has outrun what its roots can supply: wilting through the hottest part of the day, flower and fruit drop, and stalled growth. A plant that wilts at midday and recovers by evening is showing heat stress rather than drought, and watering it at midday does not address the cause.

   Points towards it

   • · the rolling followed a hot spell
   • · an unventilated greenhouse reaches far higher temperatures than the air outside

   Argues against it

   • · the compost is dry, which makes simple water shortage the better explanation — heat stress is diagnosed on a plant that has water available and still cannot keep up

   Check this next

   Look at the plant in the evening. Heat stress eases once the temperature falls and the leaves relax; a plant still rolled at dusk with dry compost is short of water instead.

   What to do now

   Ventilate and shade during the hottest hours, and water in the early morning or evening rather than at midday. Watering a heat-stressed plant at noon does not address the cause and wastes most of the water.

   ·source

   Sourced guidancemoderate confidence

   • Royal Horticultural Society: Greenhouse management

   Checked 2026-08-13

Narrow it down

This page lists everything at once, which is the right shape for reading and the wrong shape for deciding. The interactive tool asks one question at a time, starting with whichever would separate these causes fastest, and stops as soon as further answers would not help.

Opens with the plant and the symptom already set. Nothing you answer is stored or sent anywhere — the answers live in the address bar and nowhere else.

What this does not cover

These are the causes GrowingHQ holds rules for on tomato — not every cause there is. Where several problems look alike, the honest answer is often that they cannot be told apart by eye, and a page that named one would be guessing. If none of the above fits, the general leaves rolling or curling inwards page lists causes across all plants, and the Tomato profile lists the problems it is prone to.