I am transplanting an 8 year old Royal Frost Birch in Ohio; about 20 feet tall, 4" diameter clumped trunks. I pruned the roots back in June and the root ball was just dug up today, mid-March. The root ball is wrapped in burlap and blankets, and I am keeping it moist. It was supposed to be replanted tomorrow, but there is construction involved that is not allowing me to do so.
If the root ball is exposed to freezing temperatures overnight, will it cause harm? Do I need to dig a hole and temporarily plant to avoid this? It will get down to 30 F for a few hours tonight, then warm for a day, but then we are headed into nights in the low 20's after that. The tree may be looking at 4 or 5 nights in the lower 20's.