On exposed, eroded rocks, accumulations of rainwater, moss and plant debris create thick pockets of loose humus, which provide the right environment for pleiones to grow. As well as needing the protection of mosses, pleiones both crave and fear the sun. They cannot bear strong direct sunlight, so the rocks where they grow have to be shaded by large trees.
除了藉苔蘚安身立命，一葉蘭對陽光是既期待又怕受傷害，畏懼強烈日光照射，岩壁上層還必須長有大樹遮蔭。