Abstract: An outdoor garden apparatus may include a container for containing a plant growing medium therein and having an open top exposed to rainfall, a reservoir filled with nutrient enriched water, and a pump connected in fluid communication between the reservoir and the container. The outdoor garden apparatus may also include a rainfall sensor for detecting rainfall associated with the container, and a controller. The controller may cooperate with the pump for selectively flooding the nutrient enriched water into the container from the reservoir and thereafter draining the nutrient enriched water from the container back into the reservoir. The controller may selectively flood the nutrient enriched water based upon the rainfall sensor.