We grow different types of onion that grow best in Canadian climate, and you can buy them here.
Onions grow best in rich well drained soil. The more clay soil contains the more pungent onion it produces. Onions are cultivated in 3 colors: yellow, red and white - that is the color of onion bulbs that are harvested. There are other types of onions that do not produce bulbs, but rather are appreciated for the lash green leaves, i.e. leeks, scallions, welsh onion.
All types of Onion are used widely in any kitchen around the world. But also onion has long history of medicinal use as a strong antibacterial agent. When eaten raw regularly, onion increases "good" cholesterol HDL in blood. Read more about Health benefits of Onion here.