Kate, of Hills and Plains Seedsavers has been staying here for the past couple of weeks and has talked me into making extensive changes in the Kitchen Garden.
You might notice that half of the top frame is not covered in glass but in a piece of plastic. This is due to a discovery I made during the construction that glass doesn't normally bend or bounce, preferring to shatter into several pieces...... Sadly, the local glass merchant could only then offer me 2 or 4 mm thick glass and of course I need 3mm!!!!!
Kate keeps referring to this thing as a seed frame but I've always known it as a cold frame. We used concrete building blocks which we then filled with sand, to give us some thermal mass, in the hope that the blocks will hold heat gained through the day to warm the frame through the night.
I've put in a maximum - minimum thermometer to record the temperatures and from day one we made a small temperature gain over night of a couple of degrees. I hope that gain will steadily increase as the weather improves and the blocks warm.
The frame now has a few things which I have over wintered in it and is ready to receive some new seedlings as soon as they are ready.