How to Fix Common Tomato Plant Problems
May 8, 2026 
Texas A&M’s AgriLife Today, in cooperation with the Texas A&M AgriLife Extension and Joe Masabni, Ph.D., of the Department of Horticultural Sciences, recently examined common production problems that arise when growing tomatoes, their cause, and how to fix them in an article on the AgriLife Today website.
Yellowing Leaves
Masabni notes that, due to tomatoes needing a constant fertilization through the growing season, yellowing leaves are often a common nutrient issue, stemming from iron, magnesium, and nitrogen deficiencies.
To prevent/repair tomato problems stemming from nutrient deficiencies, Masabni recommends a balanced diet of fertilizer along with careful monitoring of soil moisture, as inconsistent watering can limit tomato’s ability to absorb nutrients.
Leaf Curling
Leaf curling often results not from nutrient issues, but from environmental stressors, such as high temperatures, irregular watering, and wind or physical (touch, traffic, equipment, pruning, etc.) stress.
Leaf curling on its own rarely causes permanent damage, but it is a symptom of environmental stressors that can if not properly addressed. Therefore, to avert the risk of long-term damage to tomatoes, in addition to maintaining a regular watering schedule, soil temperature should be regulated with mulch, and physical stressors should be kept to a minimum.
AgriLife also recommends that growers not overreact to temporary plant stressors during extreme weather, as such actions can cause more damage or elevate risk to a greater degree than the weather itself.
For additional information on solving common tomato crop problems (including preventing damage from herbicides, diseases, and pests), please click here to read the full article found on the AgriLife Today website.