Google search: RTI Xtreme Gardening Mykos
At Amazon and pure Mycorrhizol inoculant. It's what I used last year, $25 for a kilo or $8 for two 100gram bars.
I dipped the seedlings roots in it when I potted up and sprinkled a pinch or two in the hole. I bought the kilo and it was way overkill, you could probably do 50 seedlings on 200 grams.
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