What the hell???? You won't get very far trying to grow MJ in JUST worm castings man..., there are other elements: peat, perlite... I don't even think a seed would sprout... but worm castings are good (make sure you have live ones) for eliminating salt and other buildups in your grow medium
RastaKaze Reviewed by RastaKaze on . Worm Castings Do you still need fertilizer if you are growing in straight worm castings? Rating: 5