Mosses are harvested fresh and shipped immediately. Simply scratch the surface of the soil and lay moss pads on the soil and water well to plant. It's also recommended mosses be planted in areas of moisture or keep irrigated well in hot months. Moss is shipped year round and shipments may be delayed a few days to allow it to dry out some to prevent excessive shipping charges if there's been substantial rainfall when harvested. We offer a 1 year guarantee on all plants and mosses.