Calathea rufibarba 4 inch

Calathea Care
Calathea care can be difficult only because the plants require specific conditions and aren't particularly hardy to neglect. They're highly sensitive to chilly temperatures and grow best when kept in the warm, humid environments. 

Light
While it might seem counterintuitive for a tropical plant, but calatheas prefer filtered light or shade. They're used to growing beneath a canopy of trees on the jungle floor which receives dappled light. When growing them indoors, indirect sun from an east-, south-, or west-facing window should suffice. It is helpful to rotate your plant, so sun hits it evenly. You might notice the leaves of your calathea moving throughout the day, folding up at night and opening wider in the morning. This is so the plant can maximize sun absorbency.

Water
Water regularly to maintain consistently moist (but not soggy) soil. Calatheas like a lot of water, but they don't want to be waterlogged.