Agave atrovirens var. mirabilis
Maguey blanco, Maguey Cenizo
An enormous, giant Agave that forms a stunning rosette, to 5 m (16 ft.) wide, with huge, bluish-grey leaves with attractive reddish thorns. It is one of the largest Agave, native to Mexico, but known only from cultivation, not from the wild. It does best in a warm temperate climate, where it needs ample room and will appreciate plenty of water in summer.