Agave tequilana planting these shoots; this has led to a considerable loss of genetic diversity in cultivated blue agave. It is rarely kept as a houseplant, but a 50-year-old blue agave in Boston grew a stalk requiring a hole in the greenhouse roof and flowered in the summer of 2006. Tequila is made only from a specific cultivar of "Agave tequilana" called 'Weber Azul'. This cultivar is larger and blue-gray in color compared to the smaller and green normal "A. tequilana". It is a rapid grower and prolific offsetter in keeping with its agricultural advantages. Tequila is produced by removing the heart
Agave eggersiana Agave eggersiana Agave eggersiana, Eggers' century plant, is an endangered species of spiky plant which grows in the Virgin Islands, in dry, exposed areas. "Agave eggersiana" is a perennial herb known in the wild only from the island of St. Croix of the U.S. Virgin Islands (USFWS 1998a). A small number of plants remain on private land and are threatened by tourist development (USFWS 1998b). Other threats include feral pigs and goats on National Park Service land (USFWS 1998b). Research needs include distribution and abundance, general biology and ecology (USFWS 1998a). The U.S. Fish and Wildlife Service requests that any