SI ZAI KUAN Mountain Tea House Reservation required SI ZAI KUAN Mountain Tea House produces and sells Taiwan native tree camellia. With the adoption of natural farming methods, the tea trees are allowed to grow freely in the forest without fertilization, spraying, pruning, or watering and are harvested once a year during the Qingming Festival. Tea trees are often taller than people and not easy to pick, hence the name “Tree Climbing Tea.”