Barley grains (Jau) is used in pooja and homa ceremonies.
The sowing of barley during Navratri is the symbolic of the first fruit. It signifies growth, prosperity and abundance. On the first day of the Navratri, grains of barley are planted in the pooja room of the house. Every day some water is sprinkled on it. On the tenth day, the shoots are about 3 - 5 inches in length. After the Navratri Pooja, these seedlings are submerged in water. This custom suggests a link to harvesting and is also indicates fertility.