Tomato Leaves Are Curling.
curling tomato leaves -- too much or too little water, or something else?
Certified GKH Gardening Expert
Tomato leaf curling is very general. Depending on the cultivar, it is part of the nature of the plant.
If this is a cultivar that isn't supposed to curl, then it could be due to drastic temperature fluctuation, or cold in general. It can also be due to lack of water, or too much water, low humidity, pH imbalance, and many other factors.
Usually, leaf curl will be coupled with other symptoms, as well.
If this is natural leaf curl, then there is nothing more to do. You will want to give it the best care possible. This article will help: