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No idea about pot specifically, but it's not totally impossible for vegetables.

Canada is a net exporter of tomatoes, many of which are grown in massive greenhouses in the middle of nowhere (e.g., https://www.npr.org/sections/thesalt/2016/06/16/473526920/ho...) As the article says, it costs a bit more to grow, but the yield and quality make up for it.

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In Australia a major tomato producer built their new greenhouse facility in the high-altitude (1km) New England region because it's cheaper to heat the greenhouses in the cold winter months than to cool them in the hot summer months in low-altitude high-temperature areas. It might be with global warming the economics of Canadian tomatoes get even better.

The regions of Canada where we grow tomatoes are not particularly cold. The greenhouse heartland here is in the southernmost part of Canada near Lake Erie and sits at the same lattitude (42) as northern California / southern Oregon, or central Italy.

Yes, it's cold in the winter because it's a continental climate, but the summers tend to be very hot and humid (mid 30C not uncommon and perceptually higher due to the high humidity.) Obviously not in Australia's heat ranges, but warmer than you'd find in most of Europe.

Many of these greenhouses are switching to growing cannabis now, with legalization.

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