Oh I forgot about my (American) persimmon! I had the Meader cultivar (the most cold hardy and parthenocarpic) for twelve years (1998-2011). A freak (for preclimate change) yo-yoing early winter in 2009 almost killed it, and it finally died the spring of 2011. I had fruit for five seasons, and the last two were 70 and 95 persimmons!
But if you're thinking the lemon tree thing, there is someone in Manitoba that grows palm trees. He constructs huge stryrofoam boxes to put over them and keeps them warmer with light bulbs through the winter. I don't do anything with my stuff, except perhaps, a deep mulch for the first two winters.
RJ, you welcome to come and visit. On another forum site, I place myself "just west of Minneapolis". I live in St. Bonifacius.
My dead persimmon stump had a glorious farewell this year:
