Before blooming, sunflower plants tilt during the day to face the sun in order to gain more sunlight for photosynthesis. This heliotropism continues for a short time when the plant blooms, young sunflower heads tracking of the sun. This is thought to help attract pollinators, as many are more attracted to warm flowers. By the time they are mature, though, sunflowers generally stop moving to remain facing east, which lets them be warmed by the rising sun. The movement of sunflowers through heliphotosynthesisotropism happens as the sunflower follows the sun, the opposite side of the sunflower stem begins to accumulate growth hormones and this causes growth which redirects the sunflower. The rough and hairy stem is branched in the upper part in wild plants, but is usually unbranched in domesticated cultivars.
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