Simple vegetable greenhouses are made of bamboo and wood. The main skeleton is built with bamboo poles and cement columns, and the outside is covered with film. However, it is best to use galvanized steel structure for long service life. You can go to the website of Weifang Sanhe Agriculture. The pictures and materials of various vegetable greenhouses are clearly written. You can understand that it is not a year to build a greenhouse. Learn more about it.