Abstract: A one-piece molded water chamber in the form of an annulus having a large open segment which permits the chamber to serve as a yoke which can be positioned on the ground surrounding the trunk of small trees at the base of the trunk. The water chamber is made of a strong, semi-rigid material so that the segmental opening can be spread apart to permit it to fit around a tree trunk which may be somewhat larger in diameter than the size of the open segment. The chamber is continuously fed with water from a standard garden hose. The wall of the chamber is pierced with a single row of water orifices which are distributed along a line around the upper, outer diameter of the annular body. This arrangement permits the watering of a tree outward, around the drip-line beneath the tree's outer foliage. In addition, this arrangement also prevents introducing water into the soil around the region immediately surrounding the tree trunk.