Overwintering Citrus in containers
What do you all do with your citrus plants over the winter and what have you found to be the pros and cons of your method?
I am in Zone 7 with relatively mild winters but the potential for hard freezes. I have access to an unheated storage building with no windows: that's it. Anything else I will have to buy or build and I am willing to buy or build something but I am on a budget.
I have thought about putting the pots in bigger pots in the ground with Styrofoam between them and heavy mulch on top, then a thick vinyl curtain attached to the house and light bulbs/Christmas lights (along the south wall of the house). Would this be enough?
Or would they survive just being stuck in the storage building with no light except once or twice a week when I am over there? (I learned last year that plumerias here can be just plucked out of the ground and stuck bare root in the garage over winter with no problem so I thought it might be worth asking)
Any other ideas? Thanks!