Approximately 4 years ago we planted 20 “Silky” Dogwood seedlings. The surviving 15 are now 5-6 feet tall. However, they have never bloomed. Does anyone know something about these trees and when they should start blooming? (Notes: A couple days after planting, all had their top 4-6 inches eaten by rabbits. However, they still grew – actually resulted in a more bush-like form. In the winter they seem to have the characteristics of the “red twig” dogwood. They are located in a mostly shaded area and have been watered but not fertilized.)