When selecting Begonia species for a terrarium, it’s important to choose ones that are well-suited to the enclosed and humid environment. When setting up a begonia terrarium, make sure to provide well-draining soil and maintain consistent moisture levels. Ensure that the terrarium receives adequate but indirect light, and monitor the humidity to ensure it stays within the preferred range for the chosen Begonia species. Regularly check the plants for any signs of stress or disease and adjust the conditions as needed to promote their health and growth.