Several leaves on my tomato plant have curled up. Why?

FAQ
Question: 

Several leaves on my tomato plant have curled up. Why?

Answer: 

The curling of the tomato leaves may be a physiological disorder referred to as leaf roll.  Affected leaves roll upward and inward.  The leaves may also become thickened, giving the foliage a leathery appearance. 

Leaf roll often occurs after a heavy rain, plants have been severely pruned, or the plant’s roots have been damaged by deep cultivation.  Leaf roll does not reduce crop yield or quality.  Leaf roll is usually a temporary problem.  Plants typically recover on their own. 

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