Before attaching the decorations, lay the pieces loosely on the wreath to come up with a design that you're happy with. Then starting with the bigger decorations, attach and layering them on the grapevine wreath.
A 12" piece of florist wire was used to wire each glass candy ornament onto the wreath. The wire was strung through the loop on the ornament and then wrapped around the narrow part of the candy, attaching it to the wreath in two places.
Pez dispensers were attached using hot glue gun, but could also be attached with florist wire.