A light, airy greenhouse in the backyard is fun to fantasize about. With a little motivation and DIY knowledge, one woman built this pretty structure in her backyard! Some vintage windows, some reclaimed wood, plus a little math and this project took shape. Karissa Cross shares the process of building this backyard greenhouse. A basic knowledge of tools is essential. Karissa says that if you think of the construction as building a variety of squares, it becomes a lot more approachable.