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RE: Using Your Greenhouse or Hoop House all WINTER to Grow your Vegetable WITHOUT HEATING IT!
Hi @gardengirlcanada, they are small hoop houses that are inexpensive. 
https://www.tunnelvisionhoops.com/caterpillar-tunnels/
Wow I never knew that something like this was available on the Market. Thank you so much
You're welcome @gardengirlcanada