Hello My tomato plants and, to a lesser extent, my pepper plants have a condition where the leaves are curling up into tight balls. They also are doing very little growing. I thought part of the problem may be lack of calcium in the soil. I pulverized drywall and worked it into the soil around the plants. Does not seem to have made any difference??? Other vegetables such as beans and zucchini are growing. Any thoughts or recommendations are greatly appreciated. Thanks