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 leaves curl down?
When the tips and edges of the leaves curl inward, also known as “cupping,” this indicates that the plant is attempting to conserve moisture. The presence of downward curling in any form is almost always an indication of overwatering or overfeeding.
How do you use Epsom salt on tomato plants?
In a spray bottle, combine approximately one teaspoon of Epsom salts with one liter (about a quarter of a gallon) of water to create a solution. Simply use a spray setting with a fine nozzle once every two weeks to moisten the leaves of your tomato plants.
