For most garden plants, flowering is a sign of renewed life. That’s not the case with the succulent blue agave (Agave tequilana). Like other agaves, tequilana flowers only at the end of the plant’s life. A 15-foot asparagus-like stalk emerges from the center, sending out puffballs of flowers at the top. The mother plant then dies, but not before producing pups at its perimeter.