Now tuck in as many stems of winterberries as desired. Keep them going in the same direction as the already-assembled pine cuttings. Push them down far enough to hold them securely in the wire structure of the wreath. Toss any berries that fall off into a martini glass to display at your bar or on the mantle, or add them to a basket of potpourri in the guest bath (remove the berries when they start to go brown or shrivel). Keep winterberries away from pets; they can be toxic.