Thanks to a grant from MidOhio Foodbank, we purchased some new season extension supplies this year. Some of what we got replaced things that were worn out or damaged, including the endwalls of our high tunnel. The most useful thing so far were two lightweight cold frames (also known as “hot boxes” since they capture sunlight like tiny greenhouses) we used to start seedlings for fall greens.
For the past few years we’ve been starting seeds in a cold frame The Spurgeon General build and set in the ground up by the house. It’s a great way to start a lot of plants all at once, without need for acclimatizing. Since they germinate and start growing outdoors, the seedlings are prepped for their move to the farm, under low tunnels to protect them from hungry bugs and and quadrupeds. With this system we can start hundreds, probably more like thousands, of seedlings at a time, with minimal effort. Keeping a 2 x 4 foot seedbed moist is a lot easier than a 24 foot row! The jump start the plants get in the frame, saves us time and space on the farm. Since we’re so small, this really impacts our growing capacity.
These new hot boxes are so light they can be lifted by one person. They have aluminum frames and UV-stable polycarbonate sides (which I am curious to see the longevity of) and screens – as well as solid – tops so they keep pests out and let rain in. We can use them in various locations, as space becomes available, then lift them up, move them to another spot, and start again.
We’ve used the frames for two rounds of seedlings over the past month and look forward to playing with them again, inside the high tunnel, after the Persephone Days have passed and things get growing again at the end of January.
Here are a few images of the cold frames in action! (Click for captions)