I'm experimenting with some 2-year grafts this year, to see if I can pull off potted Japanese maples here in my 5b/6a urban location. I'm looking for tricks those of you in the more northern JM zones use to keep your potted maples happy over the winter. I've potted them, given them a good mulch layer, and I'm experimenting with putting bubble wrap on the inside of the pot, in a layer between the pot and bark/soil mixture...I'm hoping that helps protect the pot from freezing damage, but it would be a bonus if it helped with the maple. Once they drop their leaves I'm planning on giving each pot a good insulating wrap with larger bubble wrap, then storing them in our unheated/detached garage. Any advice? What about watering during the winter? What do all of you do with yours? Anyone have photos of their winter set-up?