It is my understanding that Canada has world-class expertise in greenhouse cultivation of edible crops, including tomatoes. Many of the out-of-season crops, such as tomatoes available to the US comes from Canada (though here in Phoenix, much of that comes from Mexico).
That expertise has also been exported, to people trying to set up greenhouses in Minnesota (US).
I used to be a member of a CSA (community supported agriculture, basically buying food direct from farmers) that was setting up a new greenhouse every year, mostly for tomatoes and cucumbers - popular crops that are vulnerable to the challenges of Minnesota weather.
As an aside, they also raise heirloom-variety turkeys. Minnesota is the #1 turkey state in the country, great area for it, and 99.9% of the turkey sold is a single breed. The heirloom breeds are rare (and delicious, and expensive) treats.
That expertise has also been exported, to people trying to set up greenhouses in Minnesota (US).