Tomato Leaves Curling Up. If the leaves of your tomato plants bend or curl, the problem may be due to biological, chemical, or physical factors. Sometimes all the leaves curl, sometimes only the young leaves curl. In today’s article, we are going to look at the 5 reasons why leaves curl up on a tomato … Continue reading Tomato Leaves Curl Up on Tomato Plant – 5 Reasons & How to Fix It