Light: The light requirements make this plant an attractive choice for lower light homes, but please note: These plants do poorly in direct sun, which can bleach the leaves. Place your prayer plant in a part of a room that receives low to bright indirect light. As a rule, the darker the foliage—the lower the light requirements.
Humidity: Prayer plants enjoy a humid environment, but many varieties can handle lower levels of humidity. Ideally, they prefer a humidity level of 50 percent or more, with more sensitive varieties requiring higher humidity levels—around 60 percent. You can increase humidity levels by using a humidifier, or by placing their pot over a tray filled with pebbles and water. The pebbles will keep the pot from being submerged in water, and the natural evaporation of the water will help keep the air around the plant moist.
Water: Like all houseplants, calathea enjoy filtered or dechlorinated water, and can be a little more demanding than other houseplants. Simply fill your watering can and leave it overnight to dissipate the chlorine. If there are other chemicals in your tap water, try using filtered or distilled water instead.