Greenhouse

Typically thought of as mere season extension, these structures may hold part of the key to reliable growing through the GSM.

Design

• Mike Oehler's $50-and-up Earthen Greenhouse
• U Minnesota's Deep Winter Greenhouse (DWG)

Tools

• Suncalc.net

Materials

• SecureSet -- does not cause rot (like concrete, which will invariably get wet)

• SunTuf