Indoor farms expand to supply year-round produce to Chicago – Crain’s Chicago Business | “While greenhouses have long been a mainstay of fresh produce in Europe, the industry is still nascent in North America, where open, irrigable land is more plentiful. Substantial capital requirements and slim margins—especially in the early days of a controlled farming operation—can stymie startups and, in fact, recently caused one high-profile vertical farm to shut down in suburban Chicago. “