Re: how big does my greenhouse need to be?
The effort going into building a greenhouse will be WAY more than digging your plant and storing. Of course it would be great to have a greenhouse for other things too but if you are mainly building it for the banana you might want to consider just digging and storing.
Despite their large size these plants are very easy to dig up. The roots are soft and are cut simply by sinking the shovel in a circle around the base of the plant. Tip the thing over and it will pop right out of the hole. Have a dolly handy and roll the plant onto it. No lifting required.
I dug 8 large bananas last fall and it took about an hour and a half.
I'm building a greenhouse this year too but it will be mainly for getting plants started sooner in the spring.
The banana trees in the local nursery's greenhouse look terrible over the winter anyway. I can't imagine their heating bill.
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