Whether you are a novice gardener or an expert, you can benefit from having some sort of a backyard greenhouse. They range in size from tabletop to a large room, depending on your needs. Most can be built from recycled materials, such as scrap wood and old window frames you may already have laying around. Start your seeds and get them ready for transplanting in a small greenhouse, or maintain a year round vegetable garden. Here are 10 greenhouses you can build for your backyard. Doesn’t your thumb feel greener already?