Upright Coldframe with Cedar Back. The Upright Coldframe from Growhouse is an elegant way of growing your own personal collection of plants helping your protect young seedlings or plants from the cold & winds. This coldframe has been constructed using cedar wood, unlike most woods cedar is almost a rot free wood thanks to the natural oils found within the grain. Included with this coldframe is toughened glazing & shelving giving you all you will possibly need to grow the best possible plants. Manufactured by Growhouse.