An insert assembly converting an otherwise discarded plastic drum or bucket, and other non-corroding and waterproof containers, into a self-regulating, watering container for growing plants. It has a platform to support grow media in which plant roots become established and receive water and/or nutrients. It also has at least one cylinder, which supports the platform and contains additional grow media. Furthermore, the insert assembly preferably uses open or closed cell gasket material around the perimeter edge of the platform, that assists in maintaining separation between the grow media and the water and/or nutrient in the reservoir under the platform in the bottom portion of the bucket, drum, or other container. Grow media in the cylinder provides fluid communication with the water/nutrient in the reservoir and the grow media supported by the platform via small openings, transferring water and/or nutrients from the reservoir to plant roots via a wicking effect.
