I HAVE 48 RED TIPS (PHOTINA) ALONG MY PROPERTY LINE TO SHIELD ME FROM NEIGHBORS, THEY HAVE GROWN TO ABOUT 15 FEET. WHEN SHOULD THEY BE PRUNED AND WOULD CUTTING BACK TO 8 FEET HURT THEM? THEY ARE VERY HEALTHY I HAVE HAD NO PROBLEM WITH LEAF SPOT. THANKS FOR ANY HELP. DON dessertmaker2000@hotmail.com(posted 9669 days ago)