Very few of those companies ship to Canada, but you load up on the freebies and report back on what works best! Heheh. I'm gonna get myself a big bag of peat moss with mycorrhiza, assuming I can find one. That should be the perfect compliment to worm castings, which I can now get. Using old dried out peat moss is not recommended! Sometimes the mycorrhiza has died out and you'll have trouble rooting. Geez, I'll get this figured out eventually, hah! The lockdown hasn't helped, that's for sure.
I've heard that about nettles. I'll investigate that sometime. I think they grow around here.