Rinse petals and leaves; let dry on paper towels.
Beat powdered sugar, meringue powder, and 1/3 cup water at low speed with an electric mixer until blended; beat at high speed 4 to 5 minutes or until fluffy.
Brush powdered sugar mixture on all sides of petals, raspberries, and leaves; sprinkle with superfine sugar. Let stand on wire racks 24 hours.
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