New Red Maple nursery transplant
We just purchased a beautiful Red Maple (3" diameter, 9-10 feet tall) (Red Sunset cultivar) and will be planting it next week after the nursery delivers it. My father in law and I are digging the hole. Is it true that the width of the hole should be about 3 times the diameter of the root ball and then back fill the dirt? Also, how about soil amenities like manure, peat, fertilzer etc? Is that necessary/advisable? (We have sandy soil a bit on the gravelly side) Anyone have any suggestions? Thanks in advance!