Ideally, we recommend growing your string of turtles indoors as you will have more control over temperature, humidity, and lighting. However, you can also grow them outdoors if your USDA zone is favorable, i.e., 10-12. Ensure winter temperatures don’t dip below 50 degrees Fahrenheit (10°C), and they don’t go so high. Also, provide filtered light. Peperomia prostrata don’t like direct sunlight. Furthermore, ensure the humidity is moderate to high.