With sub-zero night temperatures, the greenhouse has been a bit too cool. On Friday morning, I discovered ice inside. Mostly, it was from the irrigation sprayers, just a surface coating, but a few plants did actually freeze. We lost a nasturtium, and I cut back some basil...we'll see if it rebounds.
Jeannie and I made this plastic second entryway on the east door. We have blocked off the west doors with "blue board" insulation sheets until we get weather stripping in them. Not pretty, but effective!

Here is our new seedling shelf. We can adjust and add more shelves to it. We put plastic over it to trap heat and moisture for the seedlings. I'm trying it out with some sunflowers seeds. Sunflowers in winter!