Avocado Tree in shock
I grew an avocado from seed four years ago and after it grew more than 15 feet tall I donated it to Stanford University-- where I live and work. It was planted in the ground about 500 feet from where I live on campus and in similar light conditions. Expectedly, the tree went into shock after the planting, but with water and care it came back and looked good after a day.
Two weeks later it has started to wilt (see picture). I assumed it was water stress and gave it a good drink and waited for it to bounce back-- no luck.
I should add that it has been fairly cold here and recently dipped below freezing.
Any help would be appreciated.