All of the sudden, most of the leaves have turned yellow. What should I do?
Weeping Cherry Tree
Certified GKH Gardening Expert
Any plant can lose some yellow leaves at any time. One thing is to look at the leaves -- is it the older ones turning yellow, or newer ones? Do they have any spots or discolorations on them? are there any insects or deformities? Also, examine the soil moisture, especially close to the root line, as explained in this article: https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
Double check your maintenance with these basics: https://www.gardeningknowhow.com/ornamental/trees/weeping-cherry/weeping-cherry-growing-tips.htm