Greenhouses aren't just appealing for those of us plant maniacs who wish to fill them with greenery. My grandmother had a lean-to greenhouse off her bedroom window that was one of my favorite places to play when I visited her Montana ranch as a kid. We could make dirt pies in January and we regularly used planting flats to fashion houses for our dolls. My husband happily goes along with my greenhouse dreams because even though he is a black thumb, he finds them charming. Do you have greenhouse dreams?