High. This past winter here was one of the coldest ones in more than a decade. South Africa is also the only country in Africa(south of the Sahara) that really tests.
Please just don't make the mistake that most people I come into contact with make and lump vegans and vegetarians into the same category. Completely different.
I do garlic at commercial scale with fertilizers but my own food is grown 100% organic. There is a big difference in taste. What we should keep in mind though is that organic is difficult/expensive to scale. I doubt that it will be possible to feed the entire global population with 100% organic food. So that tasteless tomato that you buy at the store might not be the best but it does feed you.