Leaves turning yellow on Chinese Pistache
Hi, I have two Chinese Pistache in my front yard. This is their second summer here in Dallas Tx. I dont remember about last summer but this time around the leave of both the trees are turning yellow. They started with the top leaves of the approx 15 ft trees. Now one tress just has a bunch of green leaves while the other is more than 60% yellow. Not sure if this is natural or if it is cause of too much or two less water or just a natural reaction to the excessive heat. I have seen few other Chinese Pistache trees changing color but mine seem to be the worst. Any advice would be great. Thanks in advance.