GrowingHQ
Leaves

Leaves rolling or curling inwards

Leaves curling upwards and inwards along their length, or cupping. What matters is the condition of the rolled leaf: firm, green and otherwise normal points one way, while thin, distorted, discoloured or sticky points somewhere else entirely. The roll itself is the least informative part of the observation.

When this is urgent

Every growing point is distorted and discoloured, no pest can be found, and the plant has been treated with a weedkiller or stood near one being used. Hormone weedkiller damage and virus both look like this and neither can be treated — stop feeding and spraying, and get an identification before doing anything else.

Curled, cupped and wilted leaves comparedFour panels comparing how a leaf holds itself. A healthy leaf is flat and held out from the stem, flat in cross-section. A rolled leaf is still firm and held out but its margins have curled inward towards the midrib, shown in cross-section as a tube. A cupped leaf is firm and held out with the whole blade dished upward or downward, shown in cross-section as a shallow bowl. A wilted leaf is limp and hanging from the stalk with the blade still flat, shown in cross-section as a slack drooping line. The key point is that rolling and cupping happen on a leaf that is still firm, while wilting is a loss of firmness, so squeezing the leaf separates them.Healthyflat, firmacross the leafRolledmargins inwardedges meet over the midribCuppedwhole blade disheda shallow bowl, not a tubeWiltedlimp, hangingflat, but no longer held outThe check:pinch the blade. Firm and springy → rolled or cupped. Soft and papery → wilted.Then feel the compost, because a wilt over wet compost and a wilt over dry compost are opposite faults.
The cross-section is the check. Rolling and cupping happen on a leaf that is still firm; a wilted leaf has gone soft. Feel the leaf before you decide which word you are using.

What causes it, and how to tell them apart

Work down the list making the observation under each heading. GrowingHQ will not guess which one you have — the observation is the answer.

  1. Physiological leaf rollvery common
    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Tomato leaf roll

    Checked 2026-08-13

    How to tell

    The rolled leaves are firm and a normal green, the new growth looks right, and the fruit is unaffected. Nothing is discoloured and nothing is distorted.

    source

    Horticultural consensusmoderate confidence

    No external citation — see the evidence type above.

    Checked 2026-08-13

    If it is this, do first

    Steady the watering and ventilate. No treatment is needed — this does not reduce the crop.

    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Tomato leaf roll

    Checked 2026-08-13

  2. Heat stresscommon
    source

    Sourced guidancemoderate confidence

    • Royal Horticultural Society: Heat and drought stress

    Checked 2026-08-13

    How to tell

    The rolling appears through the hottest part of the day and eases by evening, and the plant is under glass or in a container in full sun.

    source

    Horticultural consensusmoderate confidence

    No external citation — see the evidence type above.

    Checked 2026-08-13

    If it is this, do first

    Ventilate and shade during the hottest hours, and water in the early morning or evening rather than at midday.

    source

    Sourced guidancemoderate confidence

    • Royal Horticultural Society: Greenhouse management

    Checked 2026-08-13

  3. Underwateringcommon
    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Watering

    Checked 2026-08-13

    How to tell

    The compost is dry well below the surface and the whole plant is limp rather than merely rolled, recovering within hours of a thorough watering.

    source

    Horticultural consensusmoderate confidence

    No external citation — see the evidence type above.

    Checked 2026-08-13

    If it is this, do first

    Water thoroughly until it runs from the base, then keep the watering even rather than heavy and occasional.

    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Watering

    Checked 2026-08-13

  4. Aphidscommon
    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Aphids

    Checked 2026-08-13

    How to tell

    The curling is confined to the youngest tips, the leaves are distorted rather than evenly rolled, and there are colonies inside the curl with sticky honeydew below.

    source

    Horticultural consensusmoderate confidence

    No external citation — see the evidence type above.

    Checked 2026-08-13

    If it is this, do first

    Open a curled tip and look inside, then wash any colonies off with a jet of water.

    source

    Sourced guidancehigh confidence

    • Royal Horticultural Society: Aphids — control

    Checked 2026-08-13

Where GrowingHQ holds more for one plant

This page lists the causes across every plant. The plants below are the ones where something about that plant changes the answer — different candidates, or a different observation that separates them.

Vegetables

Fruit

Commonly reported on