My original inspiration for a greenhouse fort comes from vising the geodesic domes found in both Hill City and Sioux Falls. Supplies 1″ PVC pipe 2 x 6′ 2 x 4′ 3 x 3’3″ 6 x 3′ 6 x 3″ ...

Assemble the PVC frame: Build the midrib, which runs the length of the greenhouse, by connecting seven 22 1⁄2” pieces of PVC with 4-way connectors (use the 3-way connectors for the two ends ...

Greenhouses aren’t the only effective cover-ups for gardeners determined to extend the growing season. High tunnels, low tunnels and caterpillar tunnels work well, too.