Care Sheet: Begonia rex 'Amazon River' in Closed Terrarium
 
Begonia rex 'Amazon River' is a mesmerizing cultivar cherished for its lush foliage featuring vibrant green leaves with silver markings and hints of purple underneath. Here's a comprehensive care sheet tailored for cultivating Begonia rex 'Amazon River' in a closed terrarium:
 
1. Terrarium Selection:
Opt for a glass terrarium with a lid to create a humid environment conducive to the growth of Begonia rex 'Amazon River.' Ensure the terrarium has adequate ventilation to prevent excess moisture buildup.
 
2. Substrate and Drainage:
Use a well-draining, aerated substrate such as a mixture of peat moss, perlite, and orchid bark. Incorporate a layer of drainage material, like gravel or charcoal, at the bottom to prevent waterlogging.
 
3. Lighting:
Provide bright, indirect light for Begonia rex 'Amazon River.' Place the terrarium in a location with filtered sunlight or use artificial grow lights for 10-12 hours per day.
Shield the plant from direct sunlight to prevent leaf burn.
 
4. Temperature and Humidity:
Maintain a consistent temperature range of 65-75°F (18-24°C) within the terrarium, avoiding sudden fluctuations.
Ensure high humidity levels of 50-80% by misting the terrarium regularly or incorporating a humidity tray.
 
5. Watering:
Water Begonia rex 'Amazon River' moderately, allowing the top inch of soil to dry out between waterings.
Use room temperature water to avoid shocking the plant. Avoid overwatering to prevent root rot and fungal diseases.
 
6. Fertilization:
Feed Begonia rex 'Amazon River' with a balanced, water-soluble fertilizer diluted to half strength every 4-6 weeks during the growing season (spring to early fall).
Refrain from fertilizing during the dormant winter period to allow the plant to rest.
 
7. Pruning and Grooming:
Trim any yellowing or damaged leaves to maintain the plant's health and appearance. Pinch back leggy growth to encourage a bushier habit.
Regularly remove fallen leaves and debris to prevent pest infestations and diseases.
 
8. Pest and Disease Control:
Monitor Begonia rex 'Amazon River' regularly for common pests such as aphids, mealybugs, and spider mites. Treat any infestations promptly with insecticidal soap or neem oil.
Ensure adequate airflow within the terrarium to minimize the risk of fungal infections.
 
9. Monitoring:
Routinely inspect Begonia rex 'Amazon River' for signs of stress, including wilting, yellowing leaves, or pest damage. Address any issues promptly to prevent further decline.
 
By adhering to these care guidelines, you can create an optimal environment for Begonia rex 'Amazon River' to thrive and showcase its lush foliage within your closed terrarium, bringing a touch of tropical beauty to your indoor space.