I haven’t had too much trouble finding locally-produced potting soils at the garden store, but I’m unsure of how to determine quality / value compared to more well-known brands.
A couple years ago I bought a locally-made bag and it had literal plastic garbage mixed in, like someone scooped dirt out of a field and didn’t sift it at all. (Admittedly probably only a reflection on that particular product.)
I’ve also tried PROMIX and it was okay, though a bit expensive for the size of the bags I can find. (It also looks like that one is produced in Quebec but for an American company called Premier Tech.)
Has anyone used any Canadian-made potting soils in their garden? (e.g. For raised planters or pots, etc.)
The other big manufacturer other than pro mix is abs greenworld. They’re a German company but operate internationally.
Mixing your own isn’t really cost effective unless you have a bigger scale operation but it is possible. If you search around you should be able to find all the ingredients from Canadian manufacturers. Not sure if you can locally purchase though.