Quote from hurricanehawk96
Well, I've got an idea, and I would try it, but for some reason my computer can't handle the pre-release. So somebody needs to try to place vines on a ledge, and then on the block below that put a piston, so when you push the piston it will chop the vines down. Someone try it and tell me if it works!
It will chop the vines down, but you don't get any item drop. I don't think there's a single way to get vines, shears aren't working in pr2 for vines or grass.