Series of WaterFarms can be interconnected with a Texas Controller that supplies nutrient and water automatically to all the units. A 20-gallon master reservoir filled with fresh water and mild nutrient is positioned on top of the float-valve activated 20-gallon controller. As the plants draw nutrient from their individual reservoirs, the controller's level drops, causing the float valve in the controller to open and draw fresh nutrient from the master reservoir. The ideal nutrient level is maintained in all the interconnected units for days or even weeks. The Texas Controller handles up to 16 units.