Agave chrysantha IB190

This Agave is one of the most under-rated for gardeners, in my opinion. Its rather wide, small-toothed leaves go from pale silvery-white in winter to green with pinkish margins in the summer. The rosettes are often solitary, but may form a few offsets. It is very easy to grow and tolerates moisture better than many Agaves. This collection is from 6,600' in the Pinal Mountains near Globe, which is probably about as high as it grows. I will not soon forget the incredible view of canyonlands and rolling open forest from this spot! How large will these plants get? The plants from which I collected had rosettes about 4' wide. However as I drove down the south side of the mountain, plants had increasingly large rosettes, to as wide as 7'! Are the rosettes smaller because they are higher up and more exposed, or is there some genetic difference? I wouldn't be at all surprised to see plants from this collection grow 7' wide or more in a sheltered spot, with some summer water. These plants should be hardy to at least 0 °F, maybe lower once they get some size.