Some plamys are grown on straw to prevent heir fruit touching the ground (and therefore getting muddy/mouldy) - usually strawberries and squashes/pumpkins. It also helps prevent water loss from the soil in summer - as does any mulch.
But as the others say would not use it as a winter mulch, it will take forever to rot down and if dry(although unlikely!) could blow everywhere. Best thing would be to keep it for next year if you need a summer mulch for strawberries etc - if you've got somewhere dry and ventilated to keep it. Or dig it into your compost - mix it in to help it rot down rather than in a layer. It wont add any nutrients but it is a very good source of organic matter which is vital for good soil structure.