Greenhouses give farmers the advantage of growing crops that are not suited to the growing region in which they live. Although greenhouses let you grow year round, you should be aware of the advantages and disadvantages of greenhouse gardening.
Greenhouses allow you to control the temperature and humidity, a manipulation that allows you to grow vegetables year round. In these closed microcosm, you can mimic the climate of any section of the world. You also have more control of the climate, leading to better crops.
Greenhouses require a large amount of upkeep to remain functional. If you farm with a greenhouse, this year-round upkeep means no fallow periods exist where you can go on vacation or leave your crops unattended.
Greenhouses cost a lot of money -- not just to build but to maintain. Since they require heating in the winter, greenhouses will add an extra charge to your electric bill.