Gather calla lilies into a teardrop-shaped bouquet by placing each flower slightly lower than the previous one. Bind with green stem wrap or Oasis BindIt tape. Once all the flowers are secure and don't move, cut away all but five to seven stems. If you don't do this, the handle is too large and unwieldy for a bride to carry.
Ribbon wrap to conceal mechanics of the bouquet. Spray entire arrangement with either Finishing Touch or Crowning Glory, making sure to completely coat the fronts and backs of the flowers. Refrigerate until delivery. Don't rest the cut ends in more than two inches of water. Trim off any soften portion of the calla stems each day. On the wedding day, cut the stems to the desired length.