Abstract: An irrigation/fertilization filter apparatus for continuously supplying liquid to plants and trees, which comprises a reservoir for containing the liquid having a single exit aperture on its bottom; a cover releasably fitted to the reservoir, which may be adapted with a hose attachment for connection to an external water source; an inlet control for regulating the amount of liquid entering the reservoir; and an outlet control for regulating the rate at which liquid exits the reservoir. The outlet control is situated within the reservoir and consists of a layer of particulate matter, a durable primary filter member, and a porous support, which sits directly on the reservoir's bottom.