Dh built me a green house. I grow spinach, kale, and other greens over the winter. They grow very, veeeerrrry sloooowly. It does get cold enough to freeze in there. I save the plastic boxes that store bought spinach comes in to put over the little plants, and they survive.I'm also thinking about building a greenhouse for winter... opinions???
So far, I've just gotten a few snippets of greens. If it were heated, I'd be able to grow more/bigger greens, I think.
I start my veggie seeds in there too. Same thing with the plastic boxes to help hold in heat on chilly nights. Seeds like tomatoes and peppers need warm soil to germinate, so I cover the pots with plastic wrap until they sprout.
I bought 4 pepper starts this last spring, because mine were puny. All the rest of my plants I started from seed. Sure makes a difference in the cost! Veggie plants, $3.95 each?!? in April/May? I started 65 tomato plants. I saved a ton!
Cheaper by late May, which is when I bought 2 habaneros and 2 jalapenos.