Sunflowers are heliotropes, this 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.