tree boxes are a pain in the ass, SGs other option would be the route to go IMO, the faster the tap root gets into solid ground, the better off you will be, with a box, that could be 1 to 2 years to fully establish itself...the mound method allows the root to start faster downward growth into the solid soil, and as he said, stake them, just make sure you dont leave the stake straps too tight, and dont leave the stakes in too long...

since you wont be eating anything right away, i would suggest using a good organic/hydroponic fertilizer solution to speed growth and such, also, Superthrive will only add to your success.. when the tree is established, you can back completely off the fertilizer, but still run the Superthrive...

how you prune your trees also dictates how fast and how well they grow..