Pepper plant leaves are curling?

On outdoor peppers, curled leaves usually mean the plant is stressed by dry heat, wet roots, pests on new growth, cold, or spray damage.

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?

Heat and dry-soil stress can resemble herbicide or spray burn on the afternoon-sun side after hot weather, and aphids, thrips, mites, herbicide drift, and viral leaf curl can all curl the newest growth; separate them by checking soil dryness, looking for insects, and asking whether any spray drift or mottled stunted growth is present.

The causes in full

Heat and dry-soil stressMOST COMMON

How to tell
Check whether the soil is dry two inches down or cracked, and whether leaves curl most during the hottest part of the day but look better by evening or after deep watering.

What to do
If the soil is dry two inches down or baked and cracked, water slowly and deeply at the base until the root zone is wet, then add 2 to 3 inches of mulch. During extreme heat, use temporary afternoon shade cloth, and water again only when the soil is dry two inches down.

Waterlogged roots after rain or overwateringCOMMON

How to tell
The soil feels waterlogged, water may stand in the bed, and the plant may wilt or curl even though the ground is wet, often with lower leaves yellowing first.

What to do
If the soil is waterlogged, stop watering until the top few inches are no longer wet, and make shallow channels so standing water can drain away from the plant. If this spot stays soggy after storms, improve drainage with compost and raised rows before the next planting.

Aphids, thrips, or spider mitesCOMMON

How to tell
Look closely at the undersides of curled new leaves and flower buds for soft green or black aphids, tiny dark thrips and black specks, or fine webbing and moving dots from spider mites.

What to do
When you can see pests, spray the undersides of leaves with a firm hose stream, then use a labeled insecticidal soap or horticultural oil in the cool part of the day if pests remain. Repeat checks every few days because new growth can curl again if pests return.

Cold shock or light frostLESS COMMON

How to tell
This fits when curling appeared right after a cold snap or late frost, especially if exposed leaves look limp, darkened, or blistered while protected leaves look better.

What to do
Leave damaged leaves in place until you can tell which stems are still growing, and cover plants before the next cold night. If the soil is dry two inches down after the cold, water lightly; if it is damp or waterlogged, do not add more water.

Herbicide drift or spray/fertilizer burnLESS COMMON

How to tell
Suspect this if the newest leaves are twisted, narrow, or cupped, especially on one side of the plant, after weed killer, lawn spray, strong fertilizer, or another garden spray was used nearby.

What to do
If a spray happened within the last few hours, rinse the leaves with clean water right away; after that, prevent more drift and do not add fertilizer to force recovery. If the soil is dry two inches down, water normally to reduce extra stress, but do not flood the bed.

Viral leaf curl or mosaic virusRARE

How to tell
Check for new leaves that stay small, puckered, and mottled yellow-green, with the whole plant stunted and not improving after watering, weather stress, and pests are addressed.

What to do
There is no cure for a virus, so remove severely stunted plants and control aphids or whiteflies that can spread it. Keep weeds down around peppers because they can shelter both insects and viruses.

Will it recover?

Leaves curled from thirst or heat often uncurl, but leaves damaged by cold, pests, spray, or virus may stay distorted, so judge recovery by healthy new growth.

Stopping it happening again

Keep peppers in full sun with even soil moisture, mulch the bed, avoid soggy spots, protect plants from late cold, check new growth for pests weekly, and keep weed killers and strong sprays away from them.