Double Weeping Cherry Tree
The tree is 4 years old. Last year trunk split about halfway down, and now has formed a knot hole. Should I be worried about this?
Certified GKH Gardening Expert
It should be fine. Don't try to fill or cover the hole as this can cause further damage by trapping moisture and disease. You can, however, treat the area with an insecticide and a fungicide (neem oil is nice because it is both) and allow the knot hole to heal over naturally. It is usually better to let it heal itself.