Agave oroensis  
5th March 2011  
A large growing plant associated with habitations in a small area of northern Zacatecas, Mexico. I hadn't heard of it until
 I was offered this seedling.
It has been damaged in the cold but it seems to be surviving.
11th July 2014  
This one is developing a reasonable blue colour, and survived the last spell of cold winters without much damage, so I have high hopes.