The practice of growing plants in water rather than soil isn't new, though early examples are difficult to substantiate. In the 1930s, hydroponic plant culture made headlines, but the field also had conflict among researchers.

Research:

Bacon, Francis. “Sylva sylvarum; or, A natural history, in ten centuries. Whereunto is newly added the History natural and experimental of life and death, or of the prolongation of life.” London. 1670. https://archive.org/details/sylvasylvarumorn00baco/page/116/mode/2up
Britannica, The Editors of Encyclopaedia. "Hanging Gardens of Babylon". Encyclopedia Britannica, 13 Jan. 2025, https://www.britannica.com/place/Hanging-Gardens-of-Babylon
Britannica, The Editors of Encyclopaedia. "chinampa". Encyclopedia Britannica, 26 May. 2017, https://www.britannica.com/topic/chinampa
Britannica, The Editors of Encyclopaedia. "Julius von Sachs". Encyclopedia Britannica, 28 Sep. 2024, https://www.britannica.com/biography/Julius-von-Sachs.
Ebel, Roland. "Chinampas: An Urban Farming Model of the Aztecs and a Potential Solution for Modern Megalopolis". HortTechnology hortte 30.1 (2020): 13-19. < https://doi.org/10.21273/HORTTECH04310-19
Gericke, W. F. “The Complete Guide To Soilless Gardening.” Prentice Hall. 1940. https://archive.org/details/in.ernet.dli.2015.271694/page/n1/mode/2up
Gericke, W. F. “The Meaning of Hydroponics.” Science101,142-143. 1945. https://www.science.org/doi/10.1126/science.101.2615.142
"General Mills' Big Gamble on Indoor Farming." Dun's Review. 1979. https://www.nal.usda.gov/sites/default/files/card-image/DunsReviewGeneralMillsImage.jpg
“Growing Crops Without Soil.” United States Department of Agriculture. Agricultural research service. June 1965. https://www.nal.usda.gov/sites/default/files/card-image/RaisingCropsWithoutSoil1965_0.jpg
Hall, Loura. “NASA Research Launches a New Generation of Indoor Farming.” NASA. Nov. 23, 2021. https://www.nasa.gov/technology/tech-transfer-spinoffs/nasa-research-launches-a-new-generation-of-indoor-farming/
Hoagland, D.R. and D.I. Arnon. “The Water-culture Method for Growing Plants Without Soil.” Berkeley. 1950. https://archive.org/details/watercultureme3450hoag/page/n5/mode/2up
“A Hydroponic Farm on Wake Island.” Science87,12-3. (1938). DOI:1126/science.87.2263.12.u
Janick, Jules et al. “The cucurbits of mediterranean antiquity: identification of taxa from ancient images and descriptions.” Annals of botany vol. 100,7 (2007): 1441-57. doi:10.1093/aob/mcm242
Silvio, Caputo. “History, Techniques and Technologies of Soil-Less Cultivation.” Springer, Cham. https://doi.org/10.1007/978-3-030-99962-9_4
Singer, Jesse. “A Hydroponics Timeline. Garden Culture Magazine. Feb. 8, 2021. https://gardenculturemagazine.com/a-brief-overview-of-the-history-of-hydroponics/#:~:text=1627:%20Sylva%20Sylvarum,Chemist%20Jean%20Baptist%20van%20Helmont
Stanhill, G. "JOHN WOODWARD—A NEGLECTED 17TH CENTURY PIONEER OF EXPERIMENTAL BOTANY". Israel Journal of Plant Sciences 35.3-4 (1986): 225-231. https://doi.org/10.1080/0021213X.1986.10677056
Stuart, Neil W. “About Hydroponics.” Yearbook of Agriculture, U.S. Department of Agriculture. 1947. Accessed online: https://archive.org/details/yoa1947/page/289/mode/2up
Taylor, Judith. “National Nutrition Month: Hydroponics feed ailing WWII Army Air Forces personnel.” Air Force Medical Service. March 26, 2014. https://www.airforcemedicine.af.mil/News/Article/582803/national-nutrition-month-hydroponics-feed-ailing-wwii-army-air-forces-personnel/
“Plants Without Soil.” Brooklyn Eagle. Feb. 28, 1937.https://www.newspapers.com/image/52623587/?match=1&terms=hydroponics
“Hydroponics.” Courier-Journal. March 2, 1937. https://www.newspapers.com/image/107727971/?match=1&terms=hydroponics

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The complete guide to soilless gardening

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