I really recommend the article Gspevak11 shared! Using grasses in pots you can amplify mycorrhizal populations from local soil samples. The benefit being that those species are theoretically better acclimated to your region's conditions. As the grasses grow their fibrous root systems this creates abundant habitat for the mycorrhizae in the soil sample. They proliferate and when the grass senesces the fungi will sporulate making the soil around the roots rich with spores that can be used to inoculate new roots. A useful for inoculant for soil-based mycoremediation projects as well!
I did this at home with rye. You can see the fungal hyphae on the soil surface. Cool proof of concept.