Why you need a greenhouse?

A greenhouse protects from cold wind and amplifies the heat, therefore giving your plants the protection they need. There's nothing like a gleaming greenhouse. A good quality greenhouse is a structural feature in its own right. 

The purpose of a greenhouse is to magnify the light of the sun while protecting plants from freezing temperatures. Plants in greenhouses grow in containers with specifically chosen soil. Unlike an outdoor garden, your greenhouse container soil does not have the potential of harboring harmful diseases and pests. 

As a result, your greenhouse is practically sterile to fungi, bacteria and pests, such as borers. Plants do grow faster and better in the greenhouse because in a greenhouse eco-system the temperature is more controlled, the carbon dioxide content is higher as compared to the outdoor which is very important for plant growth.