3-Tier Plant Shelf and Outdoor Greenhouse With Zippered Cover by Pure Garden Grow beautiful flowers and delicious fresh produce with this 3-Tier Plant Shelf and Outdoor Greenhouse by Pure Garden. Grow beautiful flowers and delicious fresh produce with this 3-Tier Plant Shelf and Outdoor Greenhouse by Pure Garden. This mini greenhouse provides plants with a similar environment to traditional greenhouses while saving space on patios and balconies and being easy to relocate. The powder-coated iron tubing is rust-resistant for durability in wet weather and has the strength to hold heavy potted plants. A PVC cover traps heat and protects delicate plants from the cold and wind to strengthen growth. The zippered door of this greenhouse opens quickly and can be secured with straps for easy access while you tend to the plants inside.