The sunflower is famous for its large, showy flower heads and its sun-related movement during early growth. Its botanical genus is Helianthus, from Greek words meaning “sun” and “flower.”
The familiar common sunflower, Helianthus annuus, is native to North America and was domesticated by Indigenous peoples thousands of years ago. Its broad head is actually an inflorescence containing hundreds or thousands of tiny disk florets, surrounded by yellow ray florets that look like petals.
A common mix-up is the belief that mature sunflower heads continuously follow the Sun across the sky. Young sunflower buds do show heliotropism: they face east at dawn, turn west during the day, and reset overnight. Once the flower head matures, it generally stops moving and remains oriented eastward, which can help it warm in the morning and attract pollinators.
Sunflowers are also economically important crops, producing edible seeds and oil. Their dense spiral patterns often follow arrangements related to Fibonacci numbers.