Too much manure does not lock out anything. That is what I grow in. 400 gallons of it for each plant. Infact a random seed fell from last harvest and sprouted in the box a few months ago. Didnt do anything to it, just let nature take its course. This was the results
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And last yrs grow (I didnt do a on purpose grow this yr)
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Many many growers use manure instead of dirt for their soil and just amend with dry nutes the same as you would any super soil. After yrs of trying everything, this has the best results I've ever seen.