Why is my tree not blooming?

Pruning at the wrong time of year can reduce flowering. For example, pruning spring-blooming plants severely from fall to early spring will reduce bloom. Too much nitrogen fertilizer or a deficiency of other nutrients can also reduce bloom. A soil test could help you solve that problem. In addition, too much water or poor drainage can reduce bloom, as could freeze damage. If it is a young tree, keep in mind that seedlings can take many years before they bloom.