Hello! According to the riddle, we can know that this thing is in two different States at the beginning and at the maturity. Time is like grass, and there is no one to lean on, so it can be associated with food. When rice is young, it is like grass. When it is ripe, it will be hung by full grains of rice, and all the hammers are golden yellow, so it is always covered with gold jewelry. So the answer is rice.