Last spring, I dug up a pair of tiny maples, Acer palmatum 'Mikawa Yatsubusa,' to be exact. I planted them in 2006 so they should be almost at their ten year height of 3-4 ft. tall x 4-5 ft. wide. They are about half that size and never seemed to thrive in either of the locations where they were growing. So I decided to put them in pots on the deck. Despite some transplant shock, they did well judging by the root growth I could see late this autumn.
That's when I transferred them from a pair of Mark Skudlarek's stoneware pots into plastic containers. As soon as they lose all their leaves I will bring them into the coolest spot in the garage to overwinter. I've never tried this but know people who've done it successfully for years. Since these little trees were unhappy anyway, I figured this couldn't be much worse than their prior situation. I'll find out if I've made the right decision come spring.