End of summer update. My Americana is doing quite well after being covered with a plastic sheet last winter. I'm looking for an easier way to cover it this winter... no ideas yet.
A new candidate has volunteered for migration to the garden space. This is Agave Parasana 'Globe'. I like this plant too much to not protect it this winter. I'm thinking of covering it with a clear-ish plastic barrel that I have sawed in half. I'll bet it would work great.
Notice all the 'JC Raulston' pups popping up like weeds. Soon they will be everywhere. Still the champion of winter survival here... as far as I know.