High tunnel.....a simple inexpensive naturally ventilated quonset shaped structure constructed with metal purlins attached to metal pipes and the whole structure covered with plastic, offers the advantages of:

High Tunnels: From Construction to Production - Ppt. Presentation PDF

Visit the following links for more information on high tunnel construction, cultivation and research.

High tunnel construction and use: USDA

Penn State's center for plasticulture - Cultivation in High tunnels

High tunnel agriculture - Small fruits, vegetables and flower production in high tunnels at Mielkes farm

High tunnels over view - Virginia Co-operative Extension

USDA - Extending the life of crops in cool climates

High tunnel project at Rutgers University - Detailed view on construction and cultivation

High tunnel; season extension by NRCS, USDA