Sunflowers are heliotropes, which means they naturally orient toward the sun. The disc-shaped flower sits atop a thick stem and will have numerous petals surrounding a dark center. Traditionally a sign of positivity, happiness, cheer, luck, health, and hope, these classic flowers will add a cheerful touch to any wedding bouquet, table centerpiece, or flower arrangement. FiftyFlowers.com offers several varieties of sunflowers; all are long-lasting and vibrant. While most of the sunflowers offered are available year-round, certain varieties are seasonal.