Sigma 20™ 10x7x20.ft Greenhouse Kit (Gen 2)DESCRIPTION The Sigma 20 greenhouse is made from heavy duty aluminium which is unbreakable and it is designed for any backyard or garden space for growing everything from delicate flowers to robust vegetables especially in the winter season. With a length of 20 feet, there is enough space to grow a wide variety of plants. The Sigma 20 greenhouse also has a width of 10 feet and a height of 7 feet, making more space to work inside the greenhouse. The