I have 3 tomato plants growing outside in a 14" clay pot. There are about twenty tomatoes of various sizes, less than 2" diameter. It gets all day southern exposure until about 4:00pm. The leaves are all curling and somewhat limp, although the soil is still moist. What's up with the curling leaves, and should I allow the plant to dry out before watering? I have been watering daily and have not let them get totally dry.