Agave americana azul
This plant is shown in a 6 inch pot. You will receive a very similar plant to the one in the picture. It may or may not be blooming at the time of your purchase. The plant is shipped BARE ROOT.
Common names include Century Plant .
Blooming season: Late spring to summer, often flowering after 8-20 (or more) years.
Cultivation and propagation: Need full sun and a very well-drained, slightly acidic, sandy or gravely soil. As an ornamental it is also grown in large containers where it stays much smaller than its outdoor brethren. It is hardy to about -9° to - 12° C, particularly when dry but it is best to avoid severe freezing temperatures. Keep it in a cool, frost-free area in winter and put it out on the balcony or patio in summer. It grows fairly fast in summer if provided with copious water but allows to dry thoroughly before watering again. During the winter months, one should only water enough to keep the leaves from shriveling. They do well in full sun or a lightly shaded area.
Some of the information in this description has been found at desert-tropicals.com, llifle.com and cactus-art.biz