Also on the Yiyuan grounds is a shaded road lined on both sides by 66 banyan trees whose branches intertwine to form a verdant tunnel. These trees were originally planted on the grounds of an airforce base in Hualien, and were cut down during a project to widen the base's drainage ditches.
另外，園裡還有條著名的林蔭大道，兩旁種有六十六株枝葉幾已相連的榕樹，形成一幅綠色隧道的景象，這些樹原種植在花蓮縣空軍營區裡，因營區水溝拓寬，只得將榕樹砍去。