I haven’t covered my 6 in ground trees for about 6 years. After losing all above ground growth last winter I will be covering this year. I use these

You really only need 4 or 5 feet to have a good crop. The cages are stackable but you need some type of stake or the winter winds will blow them over. Tie branches together tightly, prune, stack 1 or 2 cages, wrap tightly with tar paper, hold temporarily with a staple, tie cord around tightly. Previous years I would pile a little dirt all along the bottom to deter mice. If they find their way in they have a warm house and all the bark they can eat. This year I will be using Bass’s suggestion of a bowl with mothballs at the bottom instead of dirt. I fashion a top from tarpaper and hot glue. The wrap takes about 15 minutes a tree.
