Potted Asparagus?

I live in Hamilton, Ontario and I have potted an asparagus plant. Now they seem to grow like the ornamental with long leaf fronds but it is supposed to be the vegetable. Now do I bring it in for the winter or just put in the shed where it will freeze but will be out of the worst of the weather? It is too late to put in the ground as we have the garden covered in wood for the wood stove. Love the heat.