I have one beautiful white blooming tree in my garden. That tree does not leaf out on some branches. I don't know why it is so. There must be some definite reason for it. The tree is surrounded by so many branches and twigs of a well growing tree or other reason behind this problem, no?
Some Branches of Tree Not Leafing Out
Certified GKH Gardening Expert
It could be due to environmental changes, nutrient deficiencies or stress related to pest or disease. Pruning may be a factor too. This article may also help: https://www.gardeningknowhow.com/ornamental/trees/tgen/tree-leafing-problems.htm