One of the most often asked questions in the last two week is about tomatoes. We've had a lot of samples in the store showing leaf curl. We see this often in certain varieties of tomato plants that are reacting to growing conditions during the season.
As long as the plants remain green and a healthy color, the leaf roll is nothing to worry about. Keep your plants well watered and tended to so they will produce a good crop of fruit. You can see what early and late blight looks like.. you will have brown/yellow leaves with spotting, an indication that you will need to apply a fungicide to rescue these plants.