Tequila is made from blue agave, specifically the Blue Weber variety (Agave tequilana Weber azul). This large succulent grows in semidry regions of western Mexico, where mineral-rich soil and high altitude create ideal conditions. Unlike most spirits, which come from grains or fruits, tequila’s base ingredient is a slow-growing desert plant that takes years to mature before it can be harvested and converted into alcohol.
The Blue Weber Agave Plant
Blue agave plants grow to about 2 meters tall, with fleshy, blue-grey leaves tipped with sharp spikes. They thrive in loamy soils above 1,500 meters in elevation across western Mexico. The plant spends years storing energy in its core as complex sugars called fructans, which are chains of fructose molecules linked to glucose. These sugars are what eventually get converted into alcohol during production.
After roughly five to seven years of growth, the plant is ready for harvest. If left unharvested, it sends up a flowering stalk that can reach 5 meters tall and bloom with yellow flowers, but this drains the sugars from the core. Tequila producers harvest the plant before it flowers to preserve maximum sugar content.
How the Agave Is Harvested
A skilled worker called a jimador cuts the agave from the ground and trims away its 200-plus leaves using a sharp, flat-bladed tool called a coa. What’s left is the plant’s dense core, called the piña because it resembles a giant pineapple. A mature piña typically weighs between 80 and 300 pounds, though most are harvested under 100 pounds. In the highlands of Jalisco, piñas weighing 500 pounds have been reported, though they’re rare.
Cooking Converts Starch to Sugar
Raw agave piñas are starchy and fibrous. They need to be cooked to break down their complex fructans into simple, fermentable sugars. This is the critical chemical transformation that makes tequila possible.
Traditional producers use brick ovens called hornos, where piñas are slow-roasted with steam for 22 hours or longer. Some brands extend this to 56 hours, including cooling time, which deepens the caramelized flavor. Modern distilleries often use stainless steel pressure cookers called autoclaves, which can finish the job in as little as 8 hours, though many run 16 to 20 hours for better flavor development.
The cooking method matters for taste. Hornos tend to produce richer, more caramelized notes, while autoclaves create a cleaner, more consistent flavor profile. Both accomplish the same goal: turning the agave’s complex sugar chains into simple sugars that yeast can ferment.
Crushing and Extracting the Juice
Once cooked, the softened piñas need to be crushed to release their sugary juice. The traditional method uses a tahona, a 2- to 3-ton wheel made of volcanic stone that slowly rolls over the cooked agave, squeezing out the liquid. Because the tahona doesn’t shred the fibers, producers often toss the crushed pulp into the fermentation tank so yeast can access any sugar still clinging to it.
Most tequila today is made using roller mills, a faster and more efficient continuous process. The trade-off is that roller mills tear the fibers more aggressively, so producers typically keep the shredded fiber out of the fermentation tanks. Tahona-milled tequilas are less common and often marketed as artisanal or traditional.
Fermentation Creates the Alcohol
The extracted agave juice, called mosto, goes into fermentation tanks where yeast converts the sugars into alcohol. Most producers use the same yeast species found in beer and wine production. The yeast doesn’t just produce alcohol. It also creates the aromatic compounds that give tequila its character: floral notes from certain alcohols, fruity notes from esters, and deeper chocolate and malty flavors from compounds called fusel alcohols. Roughly 50 different esters have been identified in tequila, and most of them form during this fermentation stage.
Double Distillation
The fermented liquid is distilled twice in pot stills. The first distillation takes about two hours and produces a cloudy liquid called ordinario at roughly 20 to 25 percent alcohol. The second distillation runs three to four hours and yields a clear spirit at about 55 percent alcohol. This is blanco tequila in its purest form, before any dilution or aging. It’s typically diluted with water before bottling to reach the standard 35 to 55 percent alcohol range.
100% Agave vs. Mixto
Not all tequila is made entirely from agave. Mexican law recognizes two categories. “100% agave” tequila uses only sugars from Blue Weber agave, with no other sugar sources allowed during fermentation. The second category, often called mixto, requires at least 51 percent of its sugars to come from Blue Weber agave. The remaining 49 percent can come from other sugar sources like cane sugar, but not from any other species of agave.
This distinction has a noticeable effect on flavor. 100% agave tequilas tend to have a more pronounced agave character, while mixto tequilas are generally lighter and less complex. If a bottle simply says “tequila” without the “100% agave” label, it’s a mixto.
Where Tequila Can Legally Be Made
Tequila carries an appellation of origin, similar to Champagne or Scotch whisky. It can only be produced in 181 municipalities across five Mexican states: Jalisco (which contains 125 of those municipalities and is the heartland of production), Michoacán, Guanajuato, Nayarit, and Tamaulipas. The Consejo Regulador del Tequila, the regulatory body overseeing the industry, enforces these geographic boundaries along with standards for production and labeling.
The geography matters beyond legality. Highland agave from Jalisco’s Los Altos region tends to produce sweeter, fruitier tequilas, while lowland or valley agave from around the town of Tequila itself yields earthier, more mineral flavors. Both come from the same plant species, but altitude, soil composition, and climate shift the sugar content and flavor compounds in the piña.
What Can Be Added After Distillation
Tequila that isn’t labeled “100% agave” can contain up to 1 percent each of four approved additives: caramel coloring, natural oak extract, glycerin, and sugar syrup. That’s a combined maximum of roughly 4 percent. These additives smooth out flavor, darken the color, and add sweetness. Even some 100% agave tequilas in aged categories (reposado, añejo) can legally contain these additives, which has become a point of controversy among enthusiasts who prefer unadulterated expressions. Blanco tequila labeled 100% agave is the category least likely to contain any additives.