Come winter here in Maryland Zone 7, we get into single digits. A large greenhouse is difficult to heat so I went to a 3 foot pop-up greenhouse. The addition of a painter’s canvas or blanket can make an additional 8-10 degree difference. I grow cool weather vegetables in the fall and winter. This blanket helps a lot.
Join My Google+ Gardening Community called Our Tomato & Vegetable Gardens – we are approaching 5000 world-wide gardeners: https://plus.google.com/communities/114956817444053979636 or Link from My YouTube Page.
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