Calathea roseopicta 'Rosie' is a variety of Calathea known for its distinctively patterned and attractively colored leaves. Here are some care tips for this houseplant:

1. Light: Calatheas, including Calathea 'Rosie', prefer bright indirect light to dim light. Avoid direct sun exposure, as this can scorch the leaves. Place the plant near a bright window, but away from direct sunlight.

2. Temperature: Maintain the plant within a temperature range of 18°C to 24°C (65°F to 75°F). Avoid cold temperatures below 15°C (60°F).

3. Watering: Keep the soil of your Calathea 'Rosie' lightly moist, but not waterlogged. Water when the top layer of soil begins to dry out. Use non-calcareous water to avoid mineral deposits. Avoid leaving the pot in standing water.

4. Humidity: Calatheas love a humid atmosphere. You can increase the humidity around the plant by placing a pebble tray filled with water near the pot or by using a humidifier. Also, mist the leaves with water from time to time.

5. Fertilization: Fertilize your Calathea 'Rosie' with a diluted balanced fertilizer approximately once a month during the growing season (spring to summer). Reduce fertilization in autumn and winter when the plant enters its dormancy period.

6. Pruning: Remove yellow or damaged leaves as they appear to encourage the growth of new leaves.

7. Common problems: Calatheas are susceptible to pests such as mealybugs and spider mites. Regularly inspect the plant and promptly treat any infestation problems.