Hi I grew plants on my deck in planters. I just bought 2 dwarf bing cherry trees. One day they will be 7-10 feet tall and in heavy 20 inch planters. How do I overwinter them since I can’t move them too far. Do I need to build a greenhouse on my deck or it’s there is more practical strategy. I’d hate to lose the investment over a bad winter. I am in Zone 6a, 1 hour north of philadelphia, with winters that temp often around zero and typically couple feet of snow per season. Plus deck gets a lot of wind.