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Helianthus is a genus comprising about 70 species of annual and perennial flowering plants in the daisy family Asteraceae commonly known as sunflowers. Sunflowers are usually tall annual or perennial plants that in some species can grow to a height of 120 inches or more. Each "flower" is actually a disc made up of tiny flowers, to form a larger false flower to better attract pollinators. Before blooming, Helianthus plant heads tilt during the day to face the sun. This movement is referred to as heliotropism, which continues for a short time when flower buds form and young Helianthus heads track the Sun. At night, the flower heads reorient their position and face East in anticipation for the sunrise. Sunflowers move back to their original position between 3am and 6am, and the leaves follow about an hour later. source wikipedia. prints available. see more at www.footeprintart.com