Calatheas (and Marantas) are called prayer plants because their leaves move up and down throughout the day. This prayer movement, called nyctinasty, is a circadian response to changes in light and the Golden Pothos Leaves Turning Yellow or Brown: Tips & Tricks Jay Vannini on velute and satin leafed Philodendron species in nature and cultivation with notes on care in home and greenhouse. Exotica Esoterica Kalachoe delagoensis (chandelier) plant care tips needed