Re: Building a raised box for a banana plant...
There has to be some level of soil moisture. Otherwise you might as well dig them up and store them under the house like make cold climate growers do. You might want to mulch heavily to keep soil/roots from freezing on those coldest nights. Maybe make you raised bed longer (across the hill) and narrower (down the slope) - 4x8 so you have more root area. You also have to remember that bananas do not stay in one place like an apple tree (for example). The pups will come up around the existing plant, so over time there will be some drift in location, so you need to account for that in you thinking about soil/raised-bed area/shape.
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