musa sikkimensis in planter box
I'm in Portland, OR and would like to plant a sikkimensis in a planter box 2' wide x6' long. I'm trying to determine if I should line the planter with rigid insulation to keep the roots warmer in winter (in addition to wrapping, etc.) - any thoughts? The box is 30" high and open on the bottom to native soil. Does anyone know how far down the roots typically go?
This is my first shot at having a musa so all suggestions are appreciated.