What a completely harmless yet unusual variety of cabbage!
A Rolling Cabbage can detect any living creature that has blood in its body to a range of 60 feet by scent.
By making a successful grapple check (with a +2 bonus for every vine-leaf attached to a foe at the beginning of its turn), a rolling cabbage can cover a grappled opponent’s nose and mouth. An opponent caught in this way must hold its breath or begin suffocating. A vineleaf attached in this way does not drain blood.
see also Jupiter Bloodsucker writeup on d20 Pathfinder SRD Rolling cabbage, also known as "Blood-sucking cabbage", are a phenomenon local to the Oatman Canyon area. For plot reasons they are particularly attracted to the scent of freshly heated salt, garlic, and rosemary, all smoked over pecan wood.