Now, here me out. I live in zone 5 at 2,700' elevation. Last winter it got -15 F. I have recently completed a deck and attached to that deck a pergola. This deck is also roughly 12' away from my septic tank. I also have built a
raised bed attached to the front of my deck next to my pergola. The planter is 8'x4'x1.5' and has roughly 6"-8" of basalt rock, river rock, and
concrete at the bottom. Why did I do this you ask? So that I could plant a vining plant and not have it invade my septic tank.
What do you think? Is this feasible? Will that much rock and concrete keep the vine's
roots circling in my raised bed? Do you have any recommendations for a vine to survive in this raised bed and also 10-12 hours of scorching hot central Washington sun? Thank you very much for your ideas.