Mikkel, I don't have backups for all the survivors at this point. I have multiple backups for the best survivors. My intention is to have a lot of flowers blooming for open cross-pollination as well as controlled pollination. The protection I reference is planting in ground, but within a structure that can be covered and insulated against record low temperatures. I find that nutritional needs are met more naturally in open soil. However, I want to maintain some control over extreme temperatures and precipitation. I selected the best drained location on the property and will begin planting very shortly, so the roots can establish before winter.
The trees won't be protected until December so the cold will remain steady until spring. In the event that there's an unusually warm period in the winter, the heat must be vented outdoors. The intent is not to provide warmth during winter, rather to protect during sub-zero temperatures.
In regards to soil fertility, this region of Pennsylvania has soils that range from mediocre to very fertile, with the limestone soils being especially fertile. The greatest challenge on my property is drainage, rather than fertility, due to the clay content in the soil.