Roethke grew up around greenhouses. His florist father and the family greenhouse provided him with powerful memories. His belief in the union between man and the natural world began in his childhood. His hometown and the Indians living there also affected Roethke's values and his attitudes toward the world. He believed the source of being is in nature. He concentrated on a simple life surrounded by plants, animals and birds. He meditated on human feelings and natural cycles. In this study I deal with greenhouse poems from his second collection, The Lost Son and Other Poems (1948), and the North American Sequence in his last collection, The Far Field (1964). The energy and search for life of a plant struggling to grow amuse the poet. His observation of and meditation on natural scenery make him affirm human life, and give him inner harmony. By remembering streams, rocks, leaves, flowers, shadow, Indian lifestyle, shorebirds, sounds and silence, Roethke goes on losing and finding himself. Through participating in the natural cycle, the poet finds reality joyful and unified. Human beings can find meaningful life only through the natural world.