These agave varietals are quite large and can take an extraordinary amount of time to mature. The Agave Blanco used for this batch was planted by Tio Rey’s grandfather 45 years ago!  Tio Rey has been watching these plants grow on his property since he was 10 years old.  The Sierra Negra takes anywhere from 10 to 25 years to mature and has a slightly higher sugar content. The higher sugar content enabled a better fermentation and a touch more yield.