5 Tequila Facts for National Tequila Day July 24 is National Tequila Day. Here are 5 tequila facts to entice your palate. 1. Tequila is made from the blue agave plant, but only the agave heart is used to make the drink. The plants take 8 to 12 years to harvest. 2. There are only five regions in Mexico that are allowed to produce tequila. 3. Some claim a specific type of tequila, Blanco tequila, won't give you a hangover. It is left in its purest form with no added sugar or corn syrup. 4. Tequila is finished with 60 percent water. 5. Mexico's agave landscape is recognized as an UNESCO World Heritage Site.