Q.Young Cherry Tree Has Bronze Colour On Leafs And They Are Curling.
Only had it 3 months
Certified GKH Gardening Expert
This is a severe magnesium deficiency. The soil pH could be way too low, there could be too much nitrogen, or the soil could remain too wet, which can lead to bacterial infections, which can also lead to low pH.
Here are some articles that will help:
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-soil.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/soil-ph-plants.htm
https://www.gardeningknowhow.com/garden-how-to/soil-fertilizers/testing-moisture-in-plants.htm
https://www.gardeningknowhow.com/edible/fruits/cherry/cherry-tree-care.htm