A self-contained plant cloning system and method for stimulating root growth from a stem of a plant. The system includes a reservoir having a base, one or more sidewalls, and an open upper end, defining an interior volume that can hold liquid. A rack rests on the upper end of the reservoir and can support a plant therein. A pump and cooling element are disposed in the reservoir and can be submerged in the liquid. The submersible pump is connected to one or more sprayers that mist liquid on the stems in order to stimulate root growth. As the pump is operated, it circulates the liquid in the reservoir. Liquid directly contacts the cooling element as it circulates in order to efficiently regulate the temperature of the environment in the reservoir.
