Large brick and stone walls and granite outcroppings seem to make for great microclimates for growing plants that might otherwise be challenged in a specific grow zone. As I have written about before, growing a full grown Hachiya persimmon in a Flushing , NY yard would normally not be possible but tuck that tree in a triangular yard between 2, 2 story brick building that provide radiant heat during both the summers and more importantly, the winters as well as completely blocking off the prevalent winds in the area allowed that tree to grow to 25 feet and produce hundreds of pounds of beautiful jumbo sized Hachiya persimmons every year.