they look like the sun and botanists call them helianthus. Helios which means sun and anthos which means flower. read more
They face east in the morning and west by the late afternoon. This trait is called heliotropism, and it means "following the sun." Scientists classify sunflowers into a special category (genus) called helianthus, which comes from the Greek words "helios" (sun) and "anthos" (flower). read more