Hadn't heard of this until it started coming up in the Denver news. Interesting flower. From what I've read, they can take anywhere from 7-20 years before they will bloom, and then maybe as long to bloom again. Smell wasn't what folks in Denver were hoping for (supposed to smell like a rotting corpse), for better or worse. 
Little more info: http://www.denverpost.com/news/ci_2...ors-disappointed-by-lack?source=hot-topic-bar
Little more info: http://www.denverpost.com/news/ci_2...ors-disappointed-by-lack?source=hot-topic-bar