Episode 5: Discovering Photosynthesis

Discovering PhotosynthesisEpisode 5  |  Host: Tiffany McCoy  |  Published: December 18, 2025  |  Runtime: 5:32Listen to Show-Me Horticulture on Spotify & YouTubeAbout This EpisodeIt's the most important chemical reaction on Earth — and most of us learned it as a formula and immediately forgot it. In this episode, Tiffany takes photosynthesis out of the textbook and puts it back where it belongs: in the leaf, the garden, and the food on your plate. From a 17th-century scientist who weighed a willow tree to the ancient cellular event that changed all life on Earth, this episode makes the science of photosynthesis genuinely fascinating. Because when you understand it, you'll never look at a plant the same way again.What You'll LearnWhy Jan van Helmont's 1648 willow tree experiment was centuries ahead of its timeHow Nicolas de Saussure (1804) proved water is an essential ingredient in photosynthesisJoseph Priestley's 1771 discovery: plants produce the oxygen we breatheHow Robert Mayer connected sunlight to stored chemical energy — the law of conservation of energyWhy chlorophyll is the plant's solar panel and how it was finally classifiedEndosymbiosis — the prehistoric 'acquisition' that created the chloroplast and changed all life on EarthHow photosynthesis and cellular respiration form a perfect planet-sized exchange system between plants and animalsWhy fossil fuels are really just ancient, compressed packages of captured sunlightThe full photosynthesis equation and what each part actually meansThe Photosynthesis Equation6CO₂ + 12H₂O + light energy → C₆H₁₂O₆ + 6O₂ + 6H₂OCarbon dioxide + Water + Light → Glucose + Oxygen + WaterScientists & Discoveries MentionedJan van Helmont (1648) — plant mass comes from water, not soilJoseph Priestley (1771) — plants produce oxygenNicolas Théodore de Saussure (1804) — water is an essential reactantRobert Mayer (1845) — sunlight stored as chemical energy (conservation of energy)20th century — chlorophyll classified as the key photosynthetic pigmentAbout Your HostTiffany McCoy is the host of Show-Me Horticulture and founder of the Show-Me Horticulture pilot farm in northeast Missouri. She is pursuing a B.S. in Sustainable Horticulture at Unity Environmental University and is passionate about connecting people to the food they grow. Every episode is rooted in real Missouri gardens, practical growing advice, and the community that makes local food so meaningful.Connect With Show-Me HorticultureEmail: [email protected] & Facebook: @ShowMeHorticulturePodcast: Spotify & YouTube — search Show-Me Horticulture📦 CSA Sign-Up: show-me-horticulture.polsia.app/#/csaIf you enjoyed this episode, please leave a review on Spotify or YouTube — it helps more Missouri gardeners find the show! 🌱