This is how I built a custom greenhouse for under $200! Supplies: Cattle panelsZipties Ground treated wood for base 2x4s HingesClear plasticScrewsPipe insulation for ends of cattle panelsInstructions: 1) first decide on the final size of your greenhouse and lay out your wood to create the base. Before you screw everything together leave it in place for a few days and observe how the sun hits the space throughout the day. You want a lot of sun, but a little shade especially in the summer can be h