Moss peat is decayed dried sphagnum moss. It is hygroscopic, i.e. it has the ability to hold water either by absorption or adsorption. Its use as packing material for sending flowers and live plants to distant places helps to keep flowers and plants fresh.
Hence Moss peat is used as a packing material and for sending flowers and live plants to distant places because it is hygroscopic.
So, the correct answer is 'Hygroscopic'.