This animated video from Science Magazine looks at how young sunflowers follow the sun from east to west during the day. When they become adults, however, this tracking stops and they stay facing east. It seems that this permanent eastward orientation makes for warmer flower faces, which may be responsible for a large increase in pollinator visits—five times more than in mature plants that face west. A new study suggests that this daily sun worship is guided by circadian rhythms during development.
You can learn more about this research by reading the brief article from Science here.