Whether you’re a greenhouse beginner or are already growing your first vegetables, you can’t know it all. We’re here to answer your questions and hope it will help you to love your vegetable garden as much as we do! How do greenhouses work? Do greenhouses need ventilation? When were greenhouses invented? Can greenhouses be used in winter? Will a greenhouse stay warm in winter? Can greenhouses be used year round? Do greenhouses need to be heated? Why is a greenhouse called a greenhouse? Will a greenhouse keep plants from freezing? Can greenhouses get too hot? Does greenhouse glass block UV? Does a greenhouse need to be in the sun? Does greenhouse plastic have to be clear? Does a greenhouse retain heat? Do you place a greenhouse indoor or outdoor?