Agave Attenuata is a species of flowering plant in the family Asparagaceae, commonly known as the foxtail or lion's tail. The name swan's neck agave refers to its development of a curved inflorescence, unusual among agaves. Native to the plateaux of central west Mexico, as one of the unarmed agaves, it is popular as an ornamental plant in gardens in many other places with subtropical and warm climates.
Although the plant can appear acaulescent, stems often reach 50 to 150 cm (20–60 in) in length, and old leaves fall off, leaving the stems visible. The leaves are ovate-acuminate, 50–70 cm (20–28 in) long and 12–16 cm (5–6 in) wide, pale in color, ranging from a light gray to a light yellowish green. There are no teeth, nor terminal spines, although the leaves taper to soft points that fray with age. The numerous, egg-shaped and tapered leaves are slightly softer than most Agave species, they are bright glaucous-gray to light yellowish green and stingless.
The inflorescence is a dense raceme 2.5 to 3 meters (8 to 10 ft) high (usually curved), with greenish-yellow flowers, growing after many years. As with other Agave species, the plant dies after floration occurs, but numerous suckers consequently sprout both from the base of the plant and from the flower raceme.
Source: Wikipedia