It's the question everyone asks. The answer is wonderfully "yes… and no" — and the real story is cleverer than the myth.
Young sunflowers do follow the sun. Mature ones don't. While a sunflower is still growing, its bud and young face track the sun across the sky from east to west during the day — then quietly swing back to the east overnight, ready to greet the next morning. This daily tracking is called heliotropism.
The plant doesn't have muscles — it moves by growing. During the day the stem grows a little more on its west side, tipping the head eastward-to-westward; at night the east side catches up, swinging it back. It's all timed by the plant's internal body clock — a circadian rhythm, just like the one that tells us when to sleep.
Once the flower fully opens and the stem stops growing, the tracking stops too — and the bloom settles facing east for good. Why east? A flower that catches the morning sun warms up faster, and warm flowers are far more attractive to bees. Researchers have found east-facing sunflowers get many more pollinator visits than west-facing ones — which means more seeds. So that permanent eastward gaze is a clever survival trick, not just a habit.