Follow these steps:

1. Bury the olla in the soil of the garden bed or planter leaving the top slightly protruding (enough so it can be seen and soil won’t spill into the opening when refilling). Ideally the neck of the olla is glazed to prevent evaporation – but you can also cover it with mulch.
   
2. Fill the olla with water and cap the opening. If you purchased a commercially made olla, it will come with a cap. If you are making your own, a clay plate, saucer, rock or another choice, whatever will prevent evaporation, soil intrusion and mosquito breeding is good.
   
3. Refill once to three times a week, depending on the soil, climate, time of year and plant needs. It’s best to keep the olla at no less than 50% full to prevent the build up of salts and minerals.
   
4. Spacing – per oyas.info – once again it “depends on plant selection, soil type and temperature. But as a general rule, plant within 18 inches from center of OLLA or 12 inches from the outer wall”.