A plant watering system includes an irrigation mat that can be placed around a plant on top of the soil. The irrigation mat includes a water reservoir that holds water, and a slow-pass water permeable membrane that releases the water in the water reservoir in a slow manner so the soil around the plant is watered at a controlled rate. The irrigation mat may optionally include a threaded port where a container of liquid fertilizer can be placed so the liquid fertilizer is mixed with the water in the reservoir, allowing easily fertilizing the plant as it is watered. The plant watering system may also optionally include a dryness sensor that provides an alert indicating the water reservoir in the irrigation mat needs to be refilled.