We all have those elusive plants, that torment you from a far. One of mine, was agave titanota black and blue. Always loved the various titanota forms (true and false). A blue form, with very dark almost black teeth was going to make it to the wish list.
After a few years it has finally arrived in Europe in larger numbers. When a little one turns up, you have to go for it.
It may be a while before it reaches it's full potential.