I just got my rhizomes from NB. (Actually Freshops as others have mentioned) There's lots of good info here on soil, watering and trellis configuration. I'm going to plant in 5 gallon buckets, as I plan to move soon. NB's info says not to expect much in growth or flowers the first year as the roots are still being established then. What I can't find is how much (vertical) growth to expect the first year. I'm trying to figure out if I really need to provide 15 to 20 feet of vertical trellis, or can I get away with less?