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Leaf curling is a tip-off for tomato watering
I noticed when I over water or when there has been more rainfall than what the plants needs, my tomatoes' leaves curl inward. The coloration of the leaf growth is proper and the plant shows no signs of disease. I offer less watering in making sure to only water at the soil surrounding the base of the plant and only when necessary. It is almost as if the tomato plant lets you know when it has too much water.
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