An automatic water feeding device includes a water storage tank, a water feeding head and a water supply tube extending therebetween. The water feeding head is constituted by the combination of a generally tubular water feeding portion made of water permeable material and having a closed end and a head portion made of watertight material coupled to the upper open end of the water feeding portion. The water feeding tubular portion is adapted to be plunged into the earth or other growing medium in the region of the roots of a plant to be watered. An outlet port through which water to be fed is delivered to the head portion via the water supply tube is provided at a position in the vicinity of the bottom of the water storage tank. The surface level of water in the water storage tank may be below the surface level of the earth or other growing medium into which the water feeding portion is plunged.
