AllenF

Thanks;
I have kept the soil from freezing in my palm shelter using copper pipe that I stick 18" into the ground. The heating cable is attached to the pipe above ground. The insulation as well as the warm pipe keep the soil at or above freezing.

I think that I will insulate down 18" to be on the safe side.

How wide do you think the root system will grow? Will a 2 foot by 4 foot area be enough for 5 years? All I want is an educated guess. It will not be that much work to dig up the insulation and move it. I just don't want to rebuild the entire shelter because I underestimated the size.

Allen

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You don't have to be crazy to grow Bananas in Alberta, but it helps