Winter watermelon was basically impossible before, but smart greenhouse construction makes it possible. Smart greenhouses differ from traditional ones mainly in automation: skylights, insulation, heating, cooling, irrigation, and bed movement are all computer-controlled. Information collection systems transmit data to computers which issue instructions. Crop growth environment including air and soil humidity, temperature, CO2 levels are monitored in real-time. Computers automatically adjust conditions according to preset parameters, saving labor and improving efficiency. This technology delivers fresh, affordable vegetables and fruits during winter months.