Recent research (can't find it right now, sorry) suggests that coffee grounds should be composted first, they can inhibit growth and be harmful to worms if dumped straight onto soil.
It would deffo be going into a composter first. Or used as the substrate for mushrooms.
Makes me think that it would be wise to brew it first either way
Recent research (can't find it right now, sorry) suggests that coffee grounds should be composted first, they can inhibit growth and be harmful to worms if dumped straight onto soil.