Harmony Farm Supply & Nursery. … Featured Products. Seedling Heat Mat 20×20 in., gardening tools, gardening supplies. Harmony Farm Supply was a pioneer in the Organics Movement as a supplier of organic fertilizers, ecological pest controls, and integrated Pest Management monitoring tools. In 1982, irrigation system components were added to the offering. In 1990, Harmony Farm Supply moved to its present location where it added a Nursery as well as more products (including Photovoltaic Solar products). Since then, Harmony Farm Supply has been the leader in providing CCOF Certified Organic vegetable starts.