Oh Lord, what a tough question to answer! A really tough one! I guess it would be my Sansevieria cylindrica. This is one
@gasrocks gave me. It's been blown out of it's pot (more like, fell off the plant stand twice and fell out of the pot) and it just keeps going! It bloomed for me last year and has a pup going wild. I really should get a better picture, this one is probably almost two years old or close to that and the baby isn't present (wasn't there until after it bloomed.