Sigma Greenhouse is a heavy duty, arch shaped, DIY garden greenhouse designed for backyard gardening. The Sigma can support 3 ft of snow, withstand 65 mph (100 km/h) winds and comes with a 5 year warranty. Enjoyed across Canada. Shipping to ON, BC, AB, SK, MB,QC, NB, NS PEI, NF. The best backyard greenhouses kits for sale. — Permalien