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Are you sure thats a sunflower? That doesn't look like one to me.http://t2.gstatic.com/images?q=tbn:B62W8gA9HHyMHM:http://wallpapers-diq.com/wallpapers/45/Sunflower.jpgHmmm, maybe yours is a young one that isn't brown in the center yet, or it's a different type of sunflower.