A method and apparatus for growing plants in a heated environment. One aspect of the invention provides an apparatus for growing plants in a heated environment, with the apparatus comprising a greenhouse, a waste heat source provided to heat the greenhouse, and a radiant heat system that heats the greenhouse using the waste heat from the waste heat source. The greenhouse may be in or upon a rooftop, a space adjacent to a factory, a space adjacent to an urban store, or a space adjacent to a suburban store. In a preferred embodiment, the plants are grown hydroponically. In a different aspect, the radiant heat system uses a food grade heat transfer fluid. In another preferred embodiment, the waste heat source is a smokestack. For other embodiments, the radiant heat system resides in a floor and/or the sides of the greenhouse.
