Sunflower

The common sunflower, Helianthus annuus, is native to North America and was cultivated by Indigenous peoples for food long before it spread worldwide as an ornamental and oilseed crop.

Botany. As with all daisies, a sunflower "flower" is a composite head of many small florets — an outer ring of showy ray florets and a central spiral of disc florets that become seeds. Those seeds sit in interlocking spirals whose counts often follow the Fibonacci sequence, an efficient packing pattern. Young flower buds show heliotropism, tracking the sun east to west by day; once mature, the heads generally settle facing east.

Care basics. Sunflowers want full sun, as their name promises, plus fertile, well-drained soil and enough water to support fast growth. Sow after the last frost; tall varieties may need staking in exposed spots. They are quick, forgiving, and dramatic, which makes them a classic first flower for children to grow.

Meaning and tradition. Because the bloom appears to follow the sun, the sunflower traditionally symbolises adoration, loyalty, and unwavering faith, along with warmth, happiness, and vitality. Its bold cheerfulness makes it a popular gift to convey positivity. As ever, these meanings are cultural readings layered onto the plant's striking behaviour.

Beyond symbolism, sunflowers are a real agricultural crop grown for seeds and oil, and their seed heads are a valuable late-season food source for birds.

A note on that Fibonacci pattern. The spirals of seeds usually number consecutive Fibonacci figures — such as 34 one way and 55 the other — because that arrangement packs the most seeds into the head without gaps or crowding. It is a real, observable feature of the plant's growth, not folklore, and it appears in many other flower heads and pine cones too. Leaving a few heads standing over winter feeds finches and other seed-eaters.