WE ARE LOOKING FOR MANUFACTURERS OF WALK-IN PORTABLE GREENHOUSES:. Your choice of 2 sizes, both with heavy-duty freeze-resistant removable PVC cover to create the "greenhouse" environment. Protects and nurtures seedlings until they're ready to transplant. The 16 mm steel tube construction is durable for years of use. Wire shelves assemble with ease, no tools or screws required. Come with anchors and guy lines to keep it firmly grounded in wind. State Size, as available in the Shopping Cart below. The perfect fit for balconies, decks, patios and small gardens.