Finally. The title came to me. It was so obvious. "Pulling up roots" connotes moving somewhere, and these veggie creatures look like they've pulled up and are on the move, so it fits. Also, I've 'pulled up roots' myself, so it has a personal meaning for me.
Thanks everyone a LOT for all of your suggestions! Some were pretty funny, I have to say. You're a creative bunch (hey, there's another title for another piece - "Creative Bunch". I get dibs!).