Covering material Plastic foil 20mi To create climate and prevent drying of the medium in the early stages of rooting of cuttings or sowing of seeds. Can be used in- and outdoors. Place the foil directly over the trays, pots or open field where cuttings or seeds are placed. Make sure the plastic is removed in time to start hardening the plants, depending on the crop this can be a few days up to a few weeks.