Agave maintenance once established. "Agave azul" (blue agave) is used in the production of tequila. In 2001, the Mexican Government and European Union agreed upon the classification of tequila and its categories. All 100% blue agave tequila must be made from the "Agave tequilana" 'Weber's Blue' agave plant, to rigorous specifications and only in certain Mexican states. The hybridized genus ×"Mangave" is created by cross-breeding species of "Manfreda" and "Agave". The ethnobotany of the agave was described by William H. Prescott in 1843: But the miracle of nature was the great Mexican aloe, or maguey, whose clustering pyramids of flowers, towering
Agave × arizonica also more cylindrical flowers. Its flowers are yellow, with 10-20 per cluster, each up to 3.5 cm (1.4 in) long. 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