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Sunflowers are usually tall annual or perennial plants that in some species can grow to a height of 300 cm or more. They bear one or more wide, terminal capitula , with bright yellow ray florets at the outside and yellow or maroon disc florets inside. Several ornamental cultivars of H. annuus have red-colored ray florets; all of them stem from a single original mutant. During growth, sunflowers tilt during the day to face the sun but stop once they begin blooming. This tracking of the sun in young sunflower heads is called heliotropism. By the time they are mature, sunflowers generally face east. The movement of sunflowers through heliotropism 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.