You can buy earthworm poop - cut out the middle man, so to speak
https://www.gardeningknowhow.com/composting/vermicomposting/worm-castings.htm
I've found that the manure they sell commercially really is crap - and not the good kind. Mostly wood byproduct scrap.
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"You go to the track with the Porsche you have, not the Porsche you wish you had."
'03 E46 M3
'57 356A
Various VWs
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