Why are corn, beans, and squash important in Mexican food?

Corn, beans, and squash are fundamental to Mexican cuisine because they form an ancient, symbiotic agricultural trinity known as milpa. This traditional intercropping system has been a cornerstone of subsistence in Mexico for thousands of years.12

These crops are nutritionally and ecologically significant for several reasons:

• Nutritional Balance: Together, these staples provide a complete and nourishing diet, offering essential starches, proteins, fats, dietary fiber, and various vitamins and minerals.1
• Agricultural Synergy: When planted together, the crops support one another. The cornstalks act as a natural trellis for the beans, while the bean plants enrich the soil with nitrogen through nitrogen-fixing bacteria. The large leaves of the squash plants shade the ground, retaining moisture and suppressing weeds.1
• Cultural Heritage: These crops are deeply embedded in Mexican history and identity, serving as the base for iconic foods like tortillas, tamales, and various regional dishes.34

Because they can be dried and stored, these three plants have historically provided food security for communities throughout the year.1