Gardman Sphagnum Moss for planters & baskets - Large This Sphagnum Moss reduces the need to water baskets, pots and containers and will line up to 3 x 14" (35cm) baskets or 2 x 16'' (40cm). Approx 29cm x 28cm x 11cm. FREE POSTAGE £10.90 Quantity: at £10.90 each Add To Basket Long lasting Sphagnum Moss. Will line up to 3 x 14'' baskets and 2 x 16'' baskets. Highly water absorbent - holds up to 20x its own weight in water. Harvested from renewable sources.