The Rumford Gardener GH7500 Portable Greenhouse Lightweight, portable greenhouse is great for sprouting seeds & starters and extending the growing season Sturdy, tubular, steel frame is powder-treated for added durability Support plants up to 13 inches high with 4, 27-by-18-inch, wire shelves The clear PVC cover provides sun exposure and insulation or unzips and rolls up for fresh air in warm weather Requires some assembly but no additional tools are required