{Quick post} When you've put so much effort into making every detail count for your wedding, the last thing you want is to arrive on your wedding day and see personal flowers and/or centerpieces that are disappointing. The best way to ensure that this doesn't happen to you is to clarify your expectations.
With your deposit ready, request a detailed written proposal from your floral designer that includes all the flowers and ribbons that have been selected, acceptable alternates, the shapes, sizes and counts of everything, and if possible- sketches.
Schedule a mock-up of your centerpieces well advance of the wedding. Some florists include this in your cost, others may charge a mock up fee.
Lastly, request to come view the flowers the day prior to your wedding (or send your planner).