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A little wonder, every day

Young sunflowers track the Sun

Документальне фото поля соняшників у Шумадії, Сербія; одна мить не доводить добового руху чи точного азимута голівок / Documentary sunflower-field photograph in Šumadija, Serbia; a single frame does not establish daily motion or the heads’ exact azimuth. Credit: Petar Milošević; CC BY-SA 3.0. https://creativecommons.org/licenses/by-sa/3.0 Source: https://commons.wikimedia.org/?curid=11096618

Документальне фото поля соняшників у Шумадії, Сербія; одна мить не доводить добового руху чи точного азимута голівок / Documentary sunflower-field photograph in Šumadija, Serbia; a single frame does not establish daily motion or the heads’ exact azimuth. Credit: Petar Milošević; CC BY-SA 3.0. https://creativecommons.org/licenses/by-sa/3.0 Source: https://commons.wikimedia.org/?curid=11096618

Listen to fact0:00 / —

Growing young sunflowers turn their shoot tips from east to west during the day and reorient eastward overnight. This heliotropism involves unequal growth on opposite sides of the stem and a circadian clock. Mature flower heads usually stop tracking and remain oriented east. Thus, the familiar claim that all flowering sunflowers follow the Sun throughout the day needs an age qualification.