Vertical farming is a method of agriculture that grows produce vertically, either in stacks or on a wall. Urban farming techniques that are used in vertical agriculture include: hydroponic, aeroponic, or geoponic methods, which refer to water-based, mist-based, and soil-based agriculture respectively. As opposed to conventional methods, popularized by industrial revolution farming, and based on using vast horizontal fields, vertical farming can grow hundreds of different crops within a limited area- making it ideal for urban environments.