Oh yeah, that is something to consider. We have a large enough property (my son does anyway) that I should be able to get enough there and we don't spray so that won't be a problem. Well, I can get enough, just not fast enough! And David does request some green material for his compost tumblers as well. I will compost weeds if they haven't gone to seed but it still makes me nervous. I still get tons of grass in my compost.