, especially when the tree is located in a fairly well-drained site, and has been established for many years?
The time to transplant a dogwood tree is usually between mid-April and early May. This is because the roots of dogwood trees are shallow, which means that they can easily be injured by frost. If your tree was planted before it had bloomed, this would prevent its flowers from opening. When you replant after flowering has been completed, you will see two or three new blooms on each flower cluster (or floret).
Page 4: In what seasons should I protect my dogwood with black plastic?