Benefits of a ground level
cold frame:
Cold Frame Design:
There are many kinds of cold
frames that are above ground and low ground. For cold climates with
moderate snowfall, I chose a design at ground level and a slanted top.
Cold Frame bins should face south for maximum sunlight exposure and have at
least a 10 percent angle to make the most of the limited sunlight in northern
regions.
Construction:
This is a simple box frame.
Size and shape all depends on your needs. Walls of cold frame should be
at least 2" below the soil level. Also remember to line the surrounding
area and the hole with a layer of gravel for water drainage. You can use fiberglass or other
transparent material such as a heavy duty plastic tarp. Ideal dimensions should be approximately 18 inches at the back and 12 at
the front to provide a good angle facing the sun and rain/snow drain off.
Heat with Christmas tree
lights.
Christmas tree lights can raise the temperature in your cold frame
by 20 degrees! You can also add a heating cable, the same kind you
wrap around water pipes to keep them from freezing. Power the lights using solar
power. Solar power is now available at the same rate as your regular
heating bill. You may also purchase a small solar panel used for lighting
driveways or opening gates for $20-$60 dollars depending on how many lights need
powering.
Natural Blanket:
Use mulch, grass clippings, or
straw for insulation around the plants. Outside the box create a 3" berm
for added insulation.
Here
are a few designs that you can build too!
