Fir boards and a clear PVC roof turn this cold frame into two things at once: a growing box on top and a slatted storage shelf underneath for trowels, gloves and spare pots. The hinged roof opens to several positions, so you can crack it for ventilation on a mild day and close it against frost at night. Clear panels let filtered light through while holding warmth around seedlings, which pushes the start of the season earlier and the harvest later, and they also keep common garden animals out. A water-based finish keeps the natural fir grain visible instead of covering it with paint. The frame measures 35.5 by 20 by 42 inches with a 35.5 by 19.5 inch shelf, and the unit weighs 13.5 lbs. Assembly is required.