Dasylirion wheeleri [select form]

The best known and one of the more spectacular of the genus, these trunk-forming plants are denizens of southeast Arizona to southern New Mexico and south into Sonora. This form from Tony Avent at Plant Delights Nursery has long and narrow, powder-blue leaves with spines along the sides, twisting slightly towards a spineless tip. Rosettes to 3' tall x 4' wide can, when mature, be topped by tall flower stalks to up to 10' tall. Prefers sun and enough drainage that it doesn't sit in winter wet, but isn't fussy about water. A good container specimen. Frost hardy to at least 0 °F, USDA zone 7 especially in bright light with good air circulation and very well-drained soil.