Abstract: A plant watering device for use in conjunction with a plant pot having a rim, the watering device responsive to maintain a desired moisture condition within the planting medium, and having housing means adapted to be readily applicable and removable from the rim of the plant pot with retaining means extending downwardly from the housing means to peripherally encompass the rim to prevent lateral movement relative thereto so that the housing means is retained in seated position relative to the plant pot. Reservoir means extends upwardly from the housing means and in partially overlapping relationship to the planting medium in the plant pot, and fluid transferring means extends between the reservoir means and into the soil medium for a gradual transfer of fluid from within the reservoir means to the planting medium.