Gustav Fechner and the Vision of the Plant-Soul
Gustav Theodor Fechner (1801–1887) was a German physicist, psychologist, philosopher, and metaphysician, best remembered as the founder of psychophysics—the study of the relationship between physical stimuli and subjective experience. Psychology textbooks often portray Fechner as a rational empiricist, a man of exacting experimental observation. But such depictions dismiss his later metaphysical works, born from an ecstatic vision of plant-souls, recounted below as it appears in his 1848 book Nanna, or On the Soul-Life of Plants (Nanna, oder, Über das Seelenleben der Pflanzen). Inspired by this vision, Fechner would publish sweeping panpsychist works claiming that not only plants, but the Earth and stars, are ensouled. He did not see these works inspired by visions as a departure from science but as a marriage of empirical rigor and metaphysical yearning.
Born into a lineage of Protestant pastors in Groß Särchen, Saxony, Fechner entered the University of Leipzig at 16 to study medicine. Disillusioned by the mechanistic worldview of his training, he turned to physics and gained recognition for his empirical work.
The vision below followed a catastrophic breakdown Fechner suffered between December 1839 and October 1843. The collapse—physical, mental, and spiritual in nature—nearly ended his life. In an 1845 account, later published by his nephew, Fechner cites several factors that contributed to his decline, most notably, overwork (Kuntze 1892: 106-126). As an unpaid physics professor at Leipzig, Fechner relied on endless freelance tasks. The stress left him with headaches, insomnia, and obsessive ruminations; he no longer derived joy from his scientific work. Amid this decline, he began to go blind, having damaged his eyes while looking at the sun during optical experiments. By 1840, he had retreated, spending most of his time in a dark room wearing a blindfold.
On October 5, 1843, Fechner stepped into his Leipzig garden, removed his blindfold, and suddenly saw plants transfigured. The flowers shone with an “inner light.” He no longer saw only petals, phloem, and fiber—he saw the “soul-light” of the plants themselves. This was not a metaphor. It was, for Fechner, a noetic experience: a direct apprehension of the inward, subjective reality of the vegetal world. He attributed the full restoration of his sight to this vision.
Fechner declared that his illness and vision loss had ushered in a “higher calling”—the contemplation of inner nature. He devoted the rest of his life to translating this experience into philosophy, beginning with Nanna. The book is part metaphysical treatise, part theological rhapsody, and part botanical meditation. Fechner argues that plants possess feelings, desires, even spiritual longings. They are conscious beings whose strivings—toward sunlight, water, and growth—reveal an inner life. But Fechner does not simply appeal to the authority conferred by his vision; instead, he supports his claims through analogical and empirical reasoning—strategies he would refine in later works.
Fechner’s vision of plant-soul placed him at odds with scientists of his era. The preeminent botanist Matthias Schleiden dismissed Nanna as scientifically and aesthetically “repugnant.” While Fechner’s metaphysics fell into obscurity, they prefigured ecological concepts such as Jakob von Uexküll’s Umwelt theory and Helmuth Plessner’s reflections on vegetal “openness.” Fechner was also a silent ancestor to the 1970s plant-consciousness revival. The Secret Life of Plants (1973)—a best seller that popularized vegetal sentience—dedicates an early chapter to him. His ideas resonate with contemporary plant neurobiologists exploring sensation, memory, and intelligence beyond the animal model.
Plants, for Fechner, were an entry point to a broader vision: the divine ensoulment of all reality. In Zend-Avesta(1851), he extended the panpsychism of Nanna to the cosmos itself. Later works, including On the Question of the Soul (Über die Seelenfrage) (1861), The Three Motives and Grounds of Faith (Die Drei Motive und Gründe des Glaubens) (1863), and The Dayview Over the Nightview (Die Tagesansicht gegenüber der Nachtansicht) (1879), would elaborate a worldview in which all things possess both inward and outward aspects, neither reducible to the other—what scholars now describe as dual-aspect monism.
Though most of his writings remain untranslated and overlooked, Fechner found vocal champions, notably William James, who lauded him as a “philosopher in the great sense.” Some deem Fechner the father of modern panpsychism, though more precisely, he articulated a dual-aspect monism that resists reducing spirit to matter—or matter to spirit. While this label remains contested, there is little doubt that Fechner offered the most elaborate and systematic panpsychist cosmology of any modern European thinker—and it was all inspired by an October botanical vision.
Source
Fechner recounts two distinct episodes of plant-soul vision in Nanna: the one that healed his sight, and a subsequent vision of the lily, which reminded him of the original revelation and encouraged him on his mission to write Nanna. Though he introduces these in reverse chronological order, they are presented chronologically below. The account is translated by Rachael Petersen.
Nanna (“Noch Einige Gedanken”) 391–392
I still remember well the impression it made on me when, after my multi-year eye illness, I stepped out from my darkened room for the first time into the blooming garden without a bandage over my eyes. It seemed like a beautiful glimpse beyond the boundary of the human. Every flower shone toward me with a peculiar clarity, as if hurling something of its inner light outward. The whole garden stood transfigured, as if it were not I but nature that had arisen anew. And I thought to myself: All it takes is to open one’s eyes anew for nature, once old, to be made young again. Indeed, one could hardly believe how fresh and lively nature strikes those who confront it with fresh eyes.
The image of the garden accompanied me back into the dim room; but it only grew brighter and more beautiful in the twilight. And suddenly I believed I saw this inner light of these flowers as the source of their outer clarity, and that I had witnessed the inner spiritual workings of their colors, which only shone through in their exterior. At the time I had no doubt that I glimpsed the flowers’ soul-light, and in a wonderfully enraptured state, I thought: this is how the garden that lay behind the walls of this world appears, and all the earth and its earthly bodies are merely enclosing fences that separate outsiders from this garden.
Imagine if you had spent a six-month-long night in the North Pole, and during that period you had almost forgotten what a tree or a flower looked like, only ever beholding barren fields of snow and ice. Imagine being suddenly transported in a blooming garden radiating with gentle light, and standing, as I had, before a row of tall Georgines. Would you not also find them shining radiantly, and suspect that behind this decoration, this glitz and glamor, there lies something greater than mere phloem fiber and water?
Alas, that bright image faded . . . no longer accessible to senses dulled by daily exposure to light. As my eyes grew accustomed, plants became again the ordinary, earthly, expressionless, futile beings that they are for all; until, in a dreamy glance, the water lily presented its floral soul to me anew, emphatically reminding me of the duty that I am now fulfilling. Certainly, there was an echo from that time; and so, I believe this book [Nanna] would hardly have been written if my sight had not once been relegated to the darkness and then so suddenly restored to light.
I have spent many hours attempting to make clear and accessible to others what moved my soul first in a few bright impressions. How much there was to dissect and reassemble! For once I first grasped the spirit of flowers, they also grasped me, and would not let me go, and forced me—though I often wanted to do otherwise—to remain in their service.
Nanna, Chapter 5 (“The Character of Plants”) 89
“What I have explained here occurred to my soul first as fleeting glimpses when I stood by the water contemplating the flower that gave me the initial impetus for these reflections. And it was as if I saw the soul of the flower itself rising in a gentle mist, and the mist dissipated as my contemplation became more certain, until finally the subtle form of the soul stood clear, transfigured, above the flower. Perhaps she wanted to ascend to the roof of her house to enjoy the sun more than she would indoors. And, believing herself unobserved, she suddenly startled to discover her childlike observer.”
Fechner provided additional details on his breakdown in an 1845 account titled “Krankheitsgeschichte,” later published by his nephew in a biography of Fechner. In this account, Fechner downplays the vision of the plant soul, but adds critical details regarding the missionary fervor and sense of divine purpose that characterized this period.
Kuntze 1892: 123-125
“I went into the garden this morning and evening (October 5) and the next day and can hardly describe the splendor of the dahlias and other flowers. All the colors and forms appeared much purer and more beautiful than I had ever seen them, and I truly believed I was discovering entirely new powers of sight, which, with further progress, would take me well beyond the capacities ordinary, healthy eyes . . .
The rapid, positive transformations in my physical and mental life (and the way they had taken place) put me in a peculiar, overexcited state of mind during the course of October and November. I attempt to describe this state in vain, as the memory has largely disappeared. What remains clear is that at the time I believed God himself had destined me for extraordinary things, and that my suffering had prepared me for them; that I believed myself to be in possession of extraordinary physical and mental powers, and on the way to greater ones, and that the whole world appeared to me in a different light, that the riddles of the world seemed to be revealed; that my previous existence was virtually extinguished, and that my current crisis granted me a new birth.”
Bibliography
Fechner, Gustav Theodor. Die Tagesansicht gegenüber der Nachtansicht. 3rd ed. Breitkopf und Härtel, 1919.
———. Nanna, oder Über das Seelenleben der Pflanzen. 4th ed. With an introduction by Kurd Lasswitz. L. Voss, 1908.
———. Professor Schleiden und der Mond. A. Gumprecht, 1856.
———. Resultate der bis jetzt unternommenen Pflanzenanalysen: Nebst ausführlich chemisch-physikalischer Beschreibung des Holzes, der Kohle, der Pflanzensäfte und einiger andern wichtigen Pflanzenkörper. L. Voss, 1829.
———. Tagebücher 1828 bis 1879. Quellen und Forschungen zur sächsischen Geschichte, vol. 27. Verlag der Sächsischen Akademie der Wissenschaften zu Leipzig; In Kommission bei Franz Steiner, 2004.
———. Über die Seelenfrage: Ein Gang durch die sichtbare Welt, um die unsichtbare zu finden. ATLA Historical Monographs Collection. Series 1 (13th Century to 1893). C.F. Amelang, 1861.
———. Zend-Avesta: Oder, Über die Dinge des Himmels und des Jenseits vom Standpunkt der Naturbetrachtung. 5th ed., same as the 4th. L. Voss, 1922.
Heidelberger, Michael. Nature From Within: Gustav Theodor Fechner and His Psychophysical Worldview. 1st ed. University of Pittsburgh Press, 2004.
James, William. A Pluralistic Universe: Hibbert Lectures at Manchester College on the Present Situation in Philosophy. Cambridge Scholars Publishing, 2008.
———. “The Doctrine of the Earth-Soul and of Beings Intermediate between Man and God.” Hibbert Journal 7 (1908): 278–289.
Kuntze, Johannes Emil. Gustav Theodor Fechner: Ein deutsches Gelehrtenleben. Breitkopf und Härtel, 1892.
Lowrie, Walter, ed. and trans. Religion of a Scientist: Selections from Gustav Th. Fechner. Pantheon Books, 1946.
Oelze, Berthold. Gustav Theodor Fechner: Seele und Beseelung. Waxmann, 1988.
Schrammen, F. R. “Kritische Analyse von G. Th. Fechners Nanna.” Verhandlungen des naturhistorischen Vereins der preussischen Rheinlande, Westfalens und des Reg.-Bezirks Osnabrück[eg24] [RP25] (1903).
Tompkins, Peter, and Christopher Bird. The Secret Life of Plants: A Fascinating Account of the Physical, Emotional, and Spiritual Relations Between Plants and Man. Harper & Row, 1973.
Woodward, William R. “Fechner’s Panpsychism: A Scientific Solution to the Mind-Body Problem.” Journal of the History of the Behavioral Sciences 8, no. 4 (1972): 367–386.
Rachael Petersen
Rachael Petersen studies the interplay of philosophy, science, and literature in the long nineteenth century, with a particular focus on how German thinkers engaged questions of mind, matter, and animacy across human and nonhuman life. Her work traces how developments in biology and psychology shaped metaphysical and political thought, examining figures such as Gustav Fechner, Ernst Haeckel, and others. Rachael holds a Bachelors from Rice University and a Master of Divinity from Harvard, where she was awarded the Esther Sellholm Walz Prize for her thesis on Fechner’s Nanna: Oder Über das Seelenleben der Pflanzen. At the Center for Study of World Religions, she launched and led the Thinking with Plants and Fungi Initiative, convening interdisciplinary public programs that explored vegetal and fungal life in relation to questions of sentience, cognition, and care.
Prior to her doctoral studies, Rachael spent a decade working at the intersection of conservation, science policy, and environmental advocacy, consulting for nonprofits and philanthropies worldwide. She has conducted fieldwork in the Amazon, Borneo, and Arctic Canada, and previously served as Senior Advisor to the National Geographic Society and Deputy Director of Global Forest Watch. Rachael is also a creative writer and poet, with work appearing in The Sun, Aeon, Harvard Divinity Bulletin, Tricycle and elsewhere. In addition to German, she speaks Spanish and Portuguese. You can learn more about Rachael at rachaelnpetersen.com.
