Gardener's Guide to the Greenhouse is a gardener's guide to the types of greenhouse available to the gardener. It can also serve as a primer to the materials used in greenhouse construction.For the gardener a greenhouse can be a wonderful investment. The gardener may use the greenhouse to grow seedlings for the garden, propagate cuttings of favorite garden plants and grow lush tropical plants. Building a greenhouse is a major project and the gardener needs to take stock of their needs and the types of materials used in greenhouse construction. Gardeners can also use an unheated greenhouse constructed over raised garden beds to over winter vegetables for early spring harvest.