When the temperature is high and there is not enough moisture in the air, the margins of the tomato leaves might die back and then twist and curl. The symptom known as physiological leaf roll can also be brought on by hot and dry conditions. This is a self-defense mechanism that causes the leaves and leaflets to curl up ever-so-slightly to prevent the plant from losing any more water (see Figure).
What does it mean when tomato leaves curl?
Curling of the Leaves Curling of the leaves is a very normal occurrence and will in no way harm your tomato plant in any way. The inward curling of leaves of this sort is usually always a reaction to some kind of environmental stress. The leaves of your plant will curl up to defend themselves if it is being subjected to an excessive amount of sun, extremely high temperatures, an excessive amount of wind, or a lack of water.
Can aphids make tomato leaves curl?
Your Tomato Leaves are Curling What Does it Mean and What Causes It?
Keep an eye out for pests. Aphids are a frequent type of insect pest that can be found in vegetable gardens. They can also cause the leaves of tomatoes to curl.