The giant dioon palm is a large, attractive and easily grown plant.
Giant dioon has shiny, stiff, light to bright green leaves that grow in an upright nest shape.
Technically the giant dioon is not a palm but rather a cycad, a living fossil, belonging to the earliest cone bearing plants which trace their origins back to the ancient flora of the early Mesozoic era. The giant dioon is the largest of the American cycads and is known to grow up to 50 high in nature. The typical landscape size for the giant dioon is 5 -12 tall and 6 across. The trunk of the adult giant dioon may grow up to 16 in diameter. The 140-240 leaflets on each leaf are small, flat, have small marginal thorns and are tapered to a sharp point.