[phrotoma]

I live in Canada but haven't heard of the hydro houses you mentioned ("hydro" here is confusingly a synonym for electricity so google isn't helping either), can you provide specifics?

[mediaman]

Canada has enormous hydroponic vegetable growing operations. They're quite impressive. I don't know really why they have built so much more than the US, but my theory is that there may be regulatory issues with importing fresh food from the Salinas valley, where much of the American vegetable crop is grown, and hydro is the best way to grow in the Canadian climate.

One company you can check out is Windset Farms.

[wussboy]

Have you seen the weather up here?!? For most of this country, growing things indoors in completely artificial environments is the only option. There may be regulatory issues at play, but mainly I would think it’s a climatic necessity.

[Scoundreller]

Indoors is more about solar insolation than climate. Southern Ontario is same latitude as northernmost california.

Check out Leamington Ontario and there are some big greenhouses.

But there’s a part of Spain where the whole city is a greenhouse: check out el ejido.