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Heavy duty plant growing question

Hi Everyone,

I call this "heavy-duty" because it is about growing more than a few
plants. I have been contemplating using a little greenhouse in the back
yard to keep tanks in to grow aquatic plants. Does anyone out there have
any experience with trying this in a climate that can go below freezing?
I'm wondering how hard it is to keep the water temperature at about 72 F at
the lowest. We don't have *really* cold winters here but we can have a
couple of weeks of snow (sometimes more) and of course it's never "tropical". 

Any ideas on whether this is crazy to think about or not are most welcome.

in Vancouver, B.C., Canada (almost the warmest city in Canada).