Just planted my first rhizome in a planter on my southern facing balcony. It's currently between 40 and 60 degrees here in Seattle. Is that too cold for it to grow? Also, after reading more it sounds like you should plant 2 rhizomes the first year. Anyone have luck planting just one? Anyway my plan is to train them to grow horizontal on my balcony railing (about 15 ft wide) and train them the opposite direction if they get too long.