1. Select a suitably sized patch of relatively flat ground for your greenhouse. Be sure there are no trees, buildings, or other objects that will c...

2. Using a tape measure, lay out a rectangle 16 feet (4.9 m) by 40 feet (12.2 m) on the ground to define the base of your greenhouse. You'll probab...

3. Lay out planting beds inside this rectangle, leaving a walkway down the center of the 40 foot (12.2 m) dimension. You may want to consider makin...

4. Choose one of the 16 foot (4.9 m) ends to be the "front" of your greenhouse, where the door will be located. With the help of a friend, bend a 2...

5. Repeat the previous step with the "back" pair of stakes and another piece of PVC.

6. Insert pairs of 3 foot (0.9 m) rebar pieces into the ground on opposite sides of the greenhouse every 5 feet (1.5 m) down each long side of your...

7. Make three 40 foot (12.2 m) pieces of PVC by gluing together pairs of 20 foot (6.1 m) pipes using PVC joint compound.

8. Center a 40 foot (12.2 m) pipe down the underside of the series of arches to form a "spine" for the greenhouse, using stainless steel wire to ma...

9. Duct tape a 40 foot (12.2 m) pipe along the the long edge of your plastic sheet, then roll it up in a few turns of the sheet (like you're making...

10. Repeat the previous step with the third 40 foot (12.2 m) piece of PVC along the opposite edge of the plastic sheet, roll it up, and duct tape i...