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 × arizonica Agave × arizonica Agave" × "arizonica is a rare plant, endemic to Arizona. It is a hybrid between two species of "Agave" in the family Asparagaceae, "A. chrysantha" and "A. toumeyana" var. "bella". It was discovered in the 1960s near a summit of the New River Mountains, near the Maricopa-Yavapai county line north of Phoenix, Arizona. "Agave" × "arizonica" is a small plant about 30 cm high and 40 cm broad. Although similar to "Agave utahensis", it has distinct differences in suckering more sparingly, in not forming a large dense clump, having leaves with a distinct dark brown margin and