6x12 FT Polycarbonate Greenhouse Raised Base and Anchor Aluminum Heavy Duty Walk-in Greenhouses for Outdoor Backyard in All Season,Black[Drainage System & Galvanized Base]The drainage gutter system can effectively drain water from the greenhouse to the outside. The sloped roof won't accumulate water on the top. alvanized base can be better fixed in the soil and protects the greenhouse from bad weather. [Sliding Door]The sliding door makes you easier to get in and out, also protects your plants or flowers from animals or pets getting inside. All detailed instruction are included