Flowers conjure a variety of emotional and sensory responses as well as memories. Loving sentiments are often attached to roses. Violets are sometimes associated with youthful sweetness and a bouquet of daisies brings cheer into any room. Gladiolas often appear in funeral arrangements and the scent of lavender might stir memories of fields of flowers on a hot summer day. A sunflower’s appearance literally fills the space with sunlight.
Though the sunflower, Helianthus annus, has been widely cultivated to produce flowers with different colors, shapes and sizes, the basic structure of the inflorescence continues to be reminiscent of the sun.
Most varieties maintain an attraction to sunlight with heliotropic buds that move to follow the sun and mature flowers that face the rising sun in the east. The botanical name Helianthus is derived from the Greek words helios for sun and anthos for flower.
Sunflowers are members of the largest family of flowering plants, the Asteraceae family. Like most family members, sunflowers have composite heads consisting of hundreds of tiny flowers clustered in the center of rays of petals that can vary in size and color depending on the cultivar. The flowers on edible varieties produce delicious seeds when pollinated. Many ornamental cultivars have been bred for their long-lasting beauty as cut flowers.
The original sunflower was an oilseed plant native to temperate North America. It was transported to Europe in the 16th century and nearly 100 cultivars, including many ornamental varieties, have since been developed.
Several edible varieties are recommended for West Hawaii gardens. The most popular, and the largest, is the Russian mammoth. Russian breeding in the 1800s produced this giant with bright gold petals and heads that reach 10 to 12 inches across on 8- to 10-foot stalks. The flowers that make up the head result in gray and white seeds.
The edible snack seed hybrid is somewhat smaller, reaching about 6 feet. This variety produces deep golden petals and heads that produce plump seed kernels. Continue reading