For those who have never set eyes on a mature blue agave, let me give you a brief description. Unless you're a professional basketball player, it's probably as tall or a little taller than you. Blue, broadsword-sized leaves come soaring up out of its heart; not only are their tips needle-sharp, but there are fierce little darts all the way along the edges. Reversing into an agave can mean you don't sit down for a week.