To care for a Calathea lancifolia (Rattlesnake Plant), provide bright, indirect light and keep the soil consistently moist but not waterlogged, allowing the top inch or two to dry between waterings. Maintain high humidity levels, ideally around 40-50%, by misting, using a humidifier, or placing the plant in a humid room like a bathroom. Fertilize monthly during the growing season with a diluted solution.
