Sala tree is over 1200 years old. Because there are seven leaflets on each petiole, it is scientifically named aesculus. According to legend, it was planted by Sima Chengzhen and Princess Yuzhen. Its flowers are milky white, fragrant and shaped like delicate candlesticks; The leaves stretch like stretched palms, and the whole tree landscape looks like countless palms holding candles, with elegant posture and full of vitality. Aesculus chinensis is a treasure tree of Buddhism. There is a story behind why it grew in this courtyard, which embodies the tolerance and integration of Chinese culture. As early as the Eastern Han Dynasty, different cultures were introduced from abroad and interacted with local cultures. The planting of this tree in this courtyard is a vivid testimony to the mutual understanding and harmonious coexistence of cultures at that time.