About Superior Growers Supply Superior Growers Supply Inc ( SGS ) is one of the premier retail and online hydroponic systems and indoor growing supply merchants in the United States. SGS began in 1983 as one of the first hydroponic merchants in America bringing growth lights, hydroponic equipment, nutrient solutions, greenhouse supplies and more. Today, our twenty employees make it their mission to sell trusted and ecologically responsible products. SGS provides grow lights, hydroponics systems, nutrients and indoor garden supplies to commercial and hobby growers, schools, restaurants, and research centers. Headquartered in Michigan, SGS has retail stores in East Lansing and Livonia, with web/mail order and distribution facilities in the Lansing area. A new west Lansing store is planned to open in late summer 2010.