An olla is a humble irrigation device: an unglazed clay vessel buried in soil, filled with water, and covered. Its usefulness comes from the material. Water can pass slowly through the pores of unglazed clay, entering the soil close to roots instead of wetting paths, leaves, and every empty patch between plants. The method is old, low-tech, and still sensible…
Read more about Olla irrigation, from clay pot to garden habit

