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High Tunnel System

High tunnels (seasonal tunnel systems for crops) are enclosed polyethylene, polycarbonate (plastic), or fabric covered structures used to cover plants to extend the growing season. High tunnels depend on the covering to raise temperatures for the plants growing inside. 

The growing season can be extended by two to four weeks by protecting crops from potentially damaging weather conditions. Due to the micro-climate inside the tunnel, crops tend to be of higher quality and produce higher yields than field-grown crops. Crops must be planted in the ground and not in containers.

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