Hi! I'm dreaming of growing an acer (or two) on my balcony. The balcony is northfacing and shady. I'd like a cultivar with fresh green leaves for that zen forest atmosphere, that has a beautiful upright form, and gets up to 2-2.5m in height (similar width is fine). After much research, the cultivars I'd most like to try are Seiryu, Koto No Ito, and Kamagata, in that order. Seiryu is almost my dream cultivar, but I worry it will get too big (Baumschule Nielsen says 4-5m for "very old" plants). I'm looking for advice on growing an acer in a container - do they ever reach the maximum height, or might I expect that growing it in a container will keep it small? Thank you!