Care Sheet: Begonia Rex 'Silver Knight' in Closed Terrariums
 
Begonia Rex 'Silver Knight' is a captivating cultivar cherished for its striking silver foliage and intricate leaf patterns, making it an exquisite addition to closed terrariums. Here's a specialized care sheet to ensure your Begonia Rex 'Silver Knight' thrives within a closed terrarium environment:
 
1. Terrarium Selection:
Choose a glass terrarium with a lid to create a controlled environment with high humidity, which Begonia Rex 'Silver Knight' prefers.
Ensure the terrarium has adequate ventilation to prevent excess moisture buildup and maintain airflow.
 
2. Substrate and Drainage:
Use a well-draining, nutrient-rich substrate suitable for terrarium plants. A mixture of peat moss, coconut coir, and perlite works well.
Incorporate a layer of drainage material, such as gravel or activated charcoal, at the bottom of the terrarium to prevent waterlogging.
 
3. Lighting:
Provide bright, indirect light for Begonia Rex 'Silver Knight.' Place the closed terrarium in a location with filtered sunlight or use artificial grow lights.
Avoid exposing the terrarium to direct sunlight, as it can cause leaf burn.
 
4. Temperature and Humidity:
Maintain a consistent temperature between 65-75°F (18-24°C) within the closed terrarium, avoiding drastic fluctuations.
Begonia Rex 'Silver Knight' thrives in high humidity. Keep humidity levels between 50-80% by misting the terrarium regularly or using a humidity tray.
 
5. Watering:
Water Begonia Rex 'Silver Knight' moderately, allowing the top inch of the soil to dry out between waterings.
Use room temperature water to avoid shocking the plant. Ensure that excess water can drain freely from the terrarium to prevent waterlogging.
 
6. Fertilization:
Feed Begonia Rex 'Silver Knight' with a balanced, water-soluble fertilizer diluted to half strength every 4-6 weeks during the growing season (spring to early fall).
Use a fertilizer specifically formulated for terrarium plants to avoid over-fertilization and nutrient buildup.
 
7. Pruning and Grooming:
Trim any yellowing or damaged leaves as needed to maintain the plant's health and appearance.
Pinch back leggy growth to promote a bushier habit and remove any dead or decaying plant material promptly.
 
8. Pest and Disease Control:
Monitor Begonia Rex 'Silver Knight' regularly for signs of pests, such as aphids or spider mites, and diseases like powdery mildew.
Treat any pest infestations promptly with insecticidal soap or neem oil, and ensure good air circulation within the closed terrarium to prevent fungal issues.
 
9. Monitoring and Maintenance:
Regularly inspect Begonia Rex 'Silver Knight' and the closed terrarium for signs of stress, pests, or disease.
Adjust care practices as needed based on the plant's response and environmental conditions.
 
By following these specialized care guidelines for closed terrariums, you can create an optimal environment for Begonia Rex 'Silver Knight' to thrive, showcasing its stunning silver foliage and enhancing the beauty of your indoor space.