To address the initial question, from seven years ago, yes. Yes is the answer. I know that because I don't buy feed for our rabbits. Eight months out of the year there is plenty of grass and clover and whatever else to feed them. The challenge is winter, obviously. I feed them bamboo foliage, evergreen eleagnus coppice, apples, chestnut meal and dried mulberry leaves in the winter. Needless to say, I don't breed our rabbits until late winter, just in time for the spring grass. So, yes, you can grow rabbits on weeds. And if you couldn't, no one would have domesticated them in the first place, and I wouldn't be growing them.