Begonia Rex thrives in bright, indirect light and prefers consistently moist soil without becoming waterlogged. Water the plant when the top inch of soil feels dry, using room-temperature water to avoid shock. Maintain high humidity by placing a humidity tray nearby or using a humidifier, as dry air can cause leaf edges to brown. Keep the temperature between 60-75°F, avoiding cold drafts and sudden temperature changes. Fertilize monthly during the growing season with a balanced, water-soluble fertilizer diluted to half strength. Regularly remove dead leaves to encourage healthy growth and prevent disease.