Question
i live in southern delaware and would like to know when
is the best time to trim a cherry blossam tree.

Answer
Prune the tree in the summer, after you have harvested the fruit. While most fruit trees are pruned in winter, cherry trees are highly vulnerable to a disease called Silver Leaf that strikes in winter, so it is better to prune them while the weather is still warm.

Cut off any dead or diseased branches. This will help the tree to focus on growing the strong, flourishing branches and prevent diseases and bacteria from sapping the tree's strength.

Remove any smaller seedlings that may be growing at the base of the tree. You can dig these up if you are careful not to injure the main tree's roots, or you can simply cut them off. They cannot stay there, however, because they will die in the shade of the larger tree and sap nutrients out of the soil that the original plant desperately needs.

Cut branches at an angle about 1/8 of an inch above the bud. This will prevent the branch from continuing to grow, but will not threaten the health of the main tree. The angled cut keeps water from sitting on the cut and creating an environment that encourages bacterial infection or disease