Ok. You take a baked but un-glazed ceramic pot, bury it in the ground with only the opening exposed, and fill it with water. The water slowly seeps into the ground, making the soil nice and moist for keeping vegetation happy. You can order them through Path to Freedom or make one yourself. In the past, these were used where water was scarce. Ancient irrigation systems rule!
http://pathtofreedom.com/shop/GardenPatch/olla.htm
