A pot assembly includes a pot having an inner part and an outer part connected to outside of the inner part. A hollow area is defined between the inner and outer parts. A recessed space is defined between the inner bottom and the periphery of the inner part. At least one hole is defined through the inner bottom of the inner part and communicates with the hollow area. A hollow hose is connected to the inner or outer part and communicates between outside of the hollow area and the hollow area. Air of outside of the hollow area communicates with the hollow area. A water-supply unit is located at the inner part and has its lower end communicating with the hollow area. A seal unit seals the top end of the water-supply unit. Liquid in the hollow area slowly spreads upward into the soil in the recessed space.
