Temperature and Humidity Control
Warm air has a higher moisture-holding capacity than cooler air; therefore as the temperature of air increases, the relative humidity decreases even though the amount of water remains constant. This relationship is important in managing humidity in the greenhouse.
Carbon Dioxide Increase
Safely and consistently elevated CO2 levels in a greenhouse make for healthy plants. Praxair's CO2 system delivers beneficial carbon dioxide directly into the greenhouse in a controlled and monitored way to ensure achieving excellent plant growth improved yield, stronger stems, a reduction in overall operating.
Pests and Disease Reduction
Greenhouses are closed environments. You can protect your crop from pests and diseases that plague your outdoor gardens.

"One of the best things about owning a greenhouse is that you can use it for a variety of things. You can grow fresh organic vegetables, flowers, bulb plants, house plants, exotic plants, and all types of seedlings. You can change what you grow in it every year or grow a mix of things. You can grow different plants at the same time if you choose to. You have the freedom to choose what you want to use your greenhouse for. No matter what you want to plant and grow, you can do it in a greenhouse."

0three concepts to choose 
Garden GreenHouse FG-2
Farmers GreenHouse FG-3