Terracotta Olla Irrigation

What is it?

Olla irrigation is an age-old method of watering plants that has been practiced for centuries in dry regions of the world, including Mexico, Spain, and North Africa. The technique uses simple, unglazed terracotta pots called ollas, which are buried in the soil near plants. As the pots are filled, they slowly release water through their porous walls, providing steady hydration right where it is needed most.

Advantages of Olla Irrigation

Terracotta ollas offer many benefits compared to surface watering or hoses. Because the water seeps directly into the root zone, the method is highly efficient and minimizes waste. Plants only draw the amount of water they need, which means less is lost to evaporation or runoff.

This gentle, consistent watering reduces stress on plants, promoting stronger root systems, healthier growth, and higher yields. By avoiding the extremes of overwatering and underwatering, ollas can also lower the risk of soil-borne diseases. For gardeners in regions where water is scarce, this approach offers a practical, eco-friendly way to maintain thriving gardens while conserving valuable resources.

How I Make Ollas

Each olla begins in my studio. I start with about half a pound of terracotta clay. I prefer clay without grog, since the gritty texture can be tough on my hands over time. After more than ten years of wheel-throwing, wedging and centering the clay are second nature, so the process flows quickly.

Once the clay is centered, I shape it into one of several forms. I make ollas in a variety of sizes and styles, each with its own purpose in the garden. Cylindrical pots, for example, are designed to deliver water deeper into the soil. They’re especially useful in dry or arid regions where water needs to reach further underground. Wide-bellied pots, on the other hand, hold more water and are well-suited for larger plants or gardens in humid climates where steady moisture is needed.

The beauty of ollas is that they can be tailored to both the needs of the plants and the preferences of the gardener. Different sizes and designs not only serve practical purposes but also add character and charm to a garden space.

After shaping, the pots are left to dry completely, which can take anywhere from several hours to a few days depending on their thickness. Once they’re ready, I fire them in my kiln at 1900 degrees Fahrenheit. This transforms the clay into a durable, reusable vessel that can last season after season.

Every olla that leaves my studio carries the marks of handcraft, made with intention to bring together tradition, function, and artistry in one timeless garden tool.