- Sun Exposure
Calathea roseopicta 'Medallion' is a cultivar of calathea selected for round leaves with brilliant markings, resembling a medallion. Calatheas are often called 'prayer plants' because of their unique leaf movements –– they raise and lower their leaves from day to night as a part of their circadian rhythm. This phenomenon is called nyctinasty. Plant movements are controlled by a flux of water pressure in the pulvini - nodes at the base of the leaves. Scientists theorize that these movements are meant to follow the sun and catch as much light as possible –– an essential trait for a forest-floor-dwelling plant!
"Calathea time lapse" on YouTube. You’re welcome.