Indoors, Calathea is tolerant of lower light conditions making it a fine houseplant. Your soil for Calathea should be highly organic and well drained. Use plenty of coarse material in the soil mix to help water flow through. Never allow roots to be soaked with standing water but they do enjoy continuous availability of water in their soil. Keep your Calathea roseopicta on a pebble tray to increase the humidity level near your plant, but do not allow your plant to sit in water. Calathea's prefer a warm location, away from cold drafts. Keep the soil moist but not soggy. If the water in your area is extremely hard, or of poor quality, water your plants with bottled water. Hard water will cause leaf spotting. If you're fortunate enough to have soft water, let the water sit out over night before watering your plants. If you have an aquarium, your can recycle the tank water, for watering your plants.