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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).