Yessss so according to my narrow understanding, it is the shorter amount of sunlight in winter that causes trees to go dormant, not actually the cold. Dormancy for trees is like sleep for us. Without it we die. What the cold does is solidify the sap wood turning it into hardwood, then prompting the tree to grow new sapwood in the spring, thus adding layers and fattening. I haven't missed a season with my elms that I grew (a little late) from seed. They've been outside on my third floor balcony in middle Tennessee for three years and thriving. Same goes for my cedar that is around 4 or 5 years old, but I've had it for 3. The more natural the winter, the healthier the tree, imho. I water less but i keep them pretty moist, and I also mist their moss pretty regularly. Also less in winter. So far, happy lil frens. Will post pics shortly.