I have a few maple (don't know which variety) seedlings, about 1 to 3' tall, and a few small oaks (again, don't know which variety) about 2 to 5' tall. What is the best time to transplant these guys? Also, any comments regarding moving them from the NYC metro area to the Washington, DC metro area (basically similar climates; not much worse in the DC summer, not much worse in the NY winter). Thanks for any recommendations.