Much of the meaning of sunflowers stems from its namesake, the sun itself. Wild sunflowers are often photographed with their tall stalks and bright petals stretched towards the sun. This unique behavior, known as phototropism, is a motif that has appeared in many ancient myths and is viewed as a symbol of loyalty and constancy. Their physical resemblance to the sun has also influenced their meanings. The sunflower's petals have been likened to bright yellow rays of sunshine, which evoke feelings of warmth and happiness. In addition, the sunflower is often associated with adoration and longevity.
For a flower which reflects so many of the sun's positive characteristics, it is little surprise that people enjoy basking in the sunflower's warming glow. With the sense of brightness and warmth that sunflowers naturally impart, they have become an ideal choice for sending sentiments of cheerfulness and sunny get well thoughts.