cofee grounds are high in nitrigen,best to compost it first with other carbon rich things like fallen leaves,,, beer no freakin way, asprin, ther was a study done with asprin in the gardening community but i havnt read up on it in awhile, but sounded promising, for garden and house plants, not sure what it would do to marijana. as for buying nutes, it would be your best way to go, and start a compost pile, its always great to have fresh compost around