I made this bouquet for the office. It lasted a very long time. Carnations are my favorite flower because they are so hardy.
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This is how I made it.
The center is oasis soaked in water & preservatives that came with the flowers from the grocery store. After I put the oasis on the cake plate I trimmed and pushed the flowers into the sides and top.
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Make sure it stays moist and you will enjoy it for a week or more.