Count on a gable greenhouse from Canopies and Tarps to make the most out of your backyard gardening. Greenhouses are a gardener's best friend because they offer a safe place to raise plants that may be delicate or out of season. The controlled environment gives plants exactly what they need to grow up healthy and ready for planting. But not all greenhouses are the same - they come in several different configurations. Gable greenhouses are considered one of the more popular designs.