A decorative light and a landscape lighting system incorporating a plurality of decorative lights. The decorative lights are structured for attachment to the top of landscape edging. The lights include a body having a channel formed in its bottom surface for receiving the top edge of landscape edging. The channel may be formed by first and second downwardly projecting walls. The surface of the walls may provide an interior profile or key shape that corresponds to the shape of the top of the landscape edging. An illumination device, such as a light emitting diode, is housed within the decorative light.