Yes, but only if you live in USDA Hardiness Zones 8 and above, and even then, some Calathea varieties should only be set outside in higher zones. Before committing your Calathea plant to the ground, check which zones it can grow outside in all year round. If you do not live in a zone that is friendly to your plant variety all year, it is best to keep it in a plant container that can be transferred indoors during cold weather.