Chinese Pistache Leaves are turning red/yellow
My first time here. Thanks for any help in advance
Last April, I had a Chinese Pistache tree planted in my backyard in full sun. The tree has been doing great up until 2 weeks ago. In Dallas, about 2 weeks ago we had a 3-day cold spell (lows were in the 40s at night and highs were in the 70s during the day). Well, since then, some leaves around the berry clusters turned red and now yellow. At first, it was just in a few spots. Now, a week later since they have been turning red, it has been spreading.
I water it as needed - I check the soil 8 inches deep. It has never been muddy or dry.