Greenhouses are meant to shelter & protect plants & flowers, especially in times of bad weather & are organised them according to your preference. The Billy Oh 4000 Lincoln Wooden Polycarbonate Greenhouse with Opening Roof Vent is one of the best greenhouses on the market. This is framed with sturdy timber. The roof & walls are built with polycarbonate for easy lighting & enough heat for the plants to grow. The opening roof vent improves the heat required for the plants to cultivate healthier. This greenhouse has different sizes to choose from, easy to assemble, well-built & well-designed for a price affordable for everyone.