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The Controlled Environment Agriculture Alliance CEA Alliance is a membership trade association representing and serving vertical farms and greenhouse producers growing fruits and vegetables in a highly controlled indoor production environment. What is Controlled Environment Agriculture. Controlled environment growers employ a variety of agricultural production methods and technology to create optimal growing conditions with rigorous environmental controls. Growers utilize innovative technologies such as hydroponics aeroponics aquaponics and soilbased systems to grow a wide variety of fruits and vegetables.