Gardman Sphagnum Moss for planters & baskets - Jumbo This Sphagnum Moss reduces the need to water baskets, pots and containers and will line up to 6 x 14" (35cm) or 4 x 16'' (40cm) baskets. Approx 36cm x 35cm x 13cm bag. FREE POSTAGE £18.95 Quantity: at £18.95 each Add To Basket Long lasting Sphagnum Moss. Will line up to 6 x 14'' baskets and 4 x 16'' baskets. Highly water absorbent - holds up to 20x its own weight in water. Harvested from renewable sources.