The Q&A Archives: tomato plants leaves are curling, but not crunchy curling

Question: I have tomato plant that the leaves have started curling in the last week or so, they still feel moist and aren't crunchy like when leaves die. What can I do to fix this problem? Also, since I don't know what kind of plant it is, how long do I wait to see if the tomatoes turn red?

Answer: The exact cause of tomato leaf roll is not fully known. It appears about the time of fruit setting, and gives the leaves a cupped appearance. The condition appears to be more common on staked and pruned plants and occurs when excessive rainfall or overwatering keeps the soil wet for extended periods of time. It is also related to intensive sunlight which causes carbohydrates to accumulate in the leaves. Some varieties of tomatoes have characteristically curled leaves. Your plants should continue to produce fruit with or without curled leaves. The fruit on your unknown tomato plant will begin to ripen by turning from dark green to pale green and then will turn red. You may have to pick a few to determine when they are ripe enough to harvest, but I suspect you'll have a bumper crop in late August or early September.


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