Im not an expert on Delray but they grow well in selma ca which rarely see temps under 28 to 30 degrees during the winter if that helps, i do not have a fruiting size tree, so i never tasted fruit yet, selma also gets over 100 degree summers so it can handle high temps as well, i dont think its as cold hardy as duke or arizona avocado tree, prob like a zutano could handle, size of fruit smaller than the new black johnson varity which also does well in central valley ca. climate. I still have Pumice to sell 29 dollars for 25 pounds that includes shipping cost anywhere in lower 48 states. Im finding my kiwis also like a high percent of pumice in potted plants.