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Place the larger, more vivid blossoms in the vase first. Then, place the smaller blooms or buds around them. This will give the arrangement a sense of stability. It will also first draw the viewer’s eyes to the center of the arrangement. In a peony arrangement, place a larger red flower in the center. Surround it with pink and white blossoms either in full bloom or in a budding stage. Add some support to the bouquet so that it doesn’t lean to one side. Use tree branches or twigs adjusted to the size of the arrangement to hold up more delicate flowers. Make sure smaller or flowers or buds are interspersed throughout the larger ones to prevent a sense of lopsidedness. For example, intersperse pink tulips, white peonies, irises, and pink delphiniums so that each color is evenly distributed throughout the arrangement. Vary the blossoms in height and color evenly throughout the arrangement. Tuck smaller flowers or buds around the edges. Keep taller plants toward the center and top. For example, arrange aster, blue veronica, blue lisianthus, and larkspur as the base colors. Add accents to the color scheme with red dahlias and “Black Prince” snapdragons inserted between the lighter hues. Do this constantly as you place the flowers inside it. Rotation will ensure you don't neglect any one area and give an even hand to the entire bouquet. When you’re satisfied with the appearance of the bouquet, tie the stems together  right at the waterline. This will pack the flowers tightly together and force them to support one another.  Use a clear elastic band to avoid detracting attention from the flowers. Use twine for a more rustic appearance. Use ribbon to add a decorative touch to a bridal bouquet. Like all organic material, dead flowers emit methane (a greenhouse gas 24 times as powerful as CO2) when taken to the landfill. Get crafty by reusing your flowers as they begin to wilt and die. Use your new creations as home décor or as unique gifts. If you have a compost heap or a municipal composting program, you can reuse your flowers by turning them into organic fertilizer. Just make sure your flowers were not treated with chemicals or grown with genetically modified seeds beforehand.

Summary:
Create a focal point. Create balance. Create variety. Rotate the vase. Tie it all together. Reuse dead flowers.