I built this cold frame a year or so ago, but did too good a job – I insulated it, put reflective material inside and had a tight fitting shower screen as a cover…. it cooked everything I put in it!
I considered just calling it a solar oven and using it to heat soup, but we’re having another go at the original purpose, this year. Clara cleared all the mint & brambleberry away and we’ve put some seedlings inside polystyrene crates in the frame. To reduce the cooking, we’ll remove the glass during day time. Fingers crossed, folks!