The regions around Dayuan make wine out of grapes, the wealthier inhabitants keeping as much as 10,000 or more piculs stored away. It can be kept for as long as twenty or thirty years without spoiling. The people love their wine and the horses love their alfalfa. The Han envoys brought back grape and alfalfa seeds to China and the emperor for the first time tried growing these plants in areas of rich soil. Later, when the Han acquired large numbers of the "heavenly horses" and the envoys from foreign states began to arrive with their retinues, the lands on all sides of the emperor's summer palaces and pleasure towers were planted with grapes and alfalfa for as far as the eye could see.