To extend the harvest, plant Chester, which starts its huge production right when Triple Crown leaves off. Very large, flavorful berries start ripening in August and an extremely heavy production continues all the way until frost. Very similar to Triple Crown, fruit is borne on vigorous, thornless canes that resist cane blight. Unusually versatile, plants do well in cooler and warmer summer areas, where berries stay firm in the heat. USDA Zones 5-9 .