I compost plant waste and vegetable peelings, with the occasional layer of grass mowings, horse manure and guinea pig straw. I have a patch of nettles at the back of our outbuildings and I have found them to be a great activator. Lovely ,crumbly, sweet smelling compost. Much better than the bought stuff, and I know it is completely organic. Helps to keep my wheelie bin a little less full too!