The exogrow aluminium large cold frame is a simple structure for cultivating seedlings and small plants a solid aluminium frame with twin wall polycarbonate glazing and two hinged lids with multi level ventilation bracket delivered flat packed but the easy slot together construction method means anybody should be able to build one as with most cold frames there is no floor allowing you to place the cold frame on a patio or decking covering potted plants or can be placed in a flower bed to