Because of the heat and the lack of moisture, the margins of the tomato leaves might often 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).
Why is my tomato leaves curling?
The leaves on your tomato plant may curl up occasionally; this is quite normal and won’t in any way harm the plant. 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.
Will curled tomato leaves uncurl?
As soon as the earth begins to dry up a little bit, the leaves should begin to uncurl within a few days. At this stage, you should start keeping track of how much water you are adding to the soil. Before adding any additional water, make sure the top one to two inches are completely dry.
