I put it in the helpful category and probably not essential, but at under 10 cents a seedling I'm doing it. It's beyond dispute that it has an effect, some plants can't grow or germinate without it.
The Promix comes with and as do many others and I wouldn't use additional if it's fresh stuff. I've read by the 2nd year bagged the myco have diminished considerably and depleted nitrogen
in the process. I'll be adding the myco to last years leftover promix and to pots of peat/coco/perlite mixes.
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