This is a bit of a post script to the Agave reports I did earlier. This is currently putting up a flower spike in Kew's Princess of Wales glasshouse so much so that they had to remove the roof panel to let it out. It first came to my attention on Kew's own webpage, along with bits and pieces via Facebook as well that their Titan Arum was in bud as well. Decided on a field trip down there, armed with the big phone to see if I could spot them and of course grab photos. One out of two wasn't bad, didn't see the Titan Arum but the Dasylirion was a great spot. Also saw a few other things in flower such as a Dyckia and a Grey Squirrel that got trapped in a bin which was great fun.
Dasylirion Flower Spike
Dasylirion Main Body
Top of the flower spike
Its a native of the Southern U.S and Mexico where it seems to have a long tradition of being used for making alcoholic drinks and as a fire making instrument (indeed I first saw this through a Ray Mears trek in the Sonora, on TV). It doesn't really flower in the UK as its not really grown much (probably being due to it not being cold hardy and also massive size) and its rare to see it bloom, I'll try and add links when its fully in bloom and I remember.