The Top 10 Most Poisonous Plants You Might Grow (but hey, "they're natural")

Dr. Russell Sharp closes out Hydroponics Daily’s 2025 run with a compact guide to the most toxic plants. He explains why “natural” or “plant‑derived” doesn’t mean safe and shares examples of species that can cause severe harm.

The episode lists the top poisonous plants to watch for, such as hemlock, giant hogweed, deadly nightshade, Brugmansia, monk’s hood, yew, oleander, castor bean, water hemlock and foxglove, plus practical safety warnings for growers and gardeners.

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Tony Knight — Colorado State UniversityRichard Walter — Colorado State UniversityJames Pfister — USDA-ARS Poisonous Plant Research LaboratoryBryan Stegelmeier — USDA-ARS Poisonous Plant Research LaboratoryMichael Ralphs — USDA-ARS Poisonous Plant Research LaboratoryDale Gardner — USDA-ARS Poisonous Plant Research LaboratoryKip Panter — USDA-ARS Poisonous Plant Research LaboratoryBenedict Green — USDA-ARS Poisonous Plant Research LaboratoryKermit Price — USDA-ARS Poisonous Plant Research LaboratoryClinton Stonecipher — USDA-ARS Poisonous Plant Research Laboratory

Kevin D. Welch — USDA-ARS Poisonous Plant Research LaboratoryDaniel Cook — USDA-ARS Poisonous Plant Research LaboratoryScott Larsen — USDA-ARS Poisonous Plant Research LaboratoryJennifer Colvin — USDA-ARS Poisonous Plant Research LaboratoryTracy McCluskey — USDA-ARS Poisonous Plant Research LaboratoryLynn James — USDA-ARSStephen B. Lee — USDA-ARSDerek Bailey — USDA-ARSMichael H. Smith — USDA-ARSDaniel R. Gardner — USDA-ARS

Elizabeth A. Dauncey — Royal Botanic Gardens, KewNicola Bates — Veterinary Poisons Information ServiceSally Bradberry — National Poisons Information ServiceSimon Thomas — National Poisons Information ServiceAllister Vale — National Poisons Information ServiceMichael J. Balick — New York Botanical GardenLewis S. Nelson — Rutgers New Jersey Medical SchoolRichard D. Shih — Weill Cornell MedicineNoah Whiteman — University of California, BerkeleySonny Larsson — Uppsala University

Sarah Lister — ASPCA Animal Poison Control CenterAhna Brutlag — Pet Poison HelplineJustine Lee — Pet Poison HelplineTina Wismer — ASPCA Animal Poison Control CenterSteven Hansen — Pet Poison HelplineTimothy J. Evans — University of IllinoisRebecca H. McClanahan — University of California, DavisPhilippa A. Smith — Royal Botanic Gardens, KewEimear M. Nic Lughadha — Royal Botanic Gardens, KewWilliam Milliken — Royal Botanic Gardens, Kew

Edward P. Krenzelok — Pittsburgh Poison CenterRobert S. Hoffman — NYU Grossman School of MedicineWilliam Banner — Oklahoma Center for Poison & Drug InformationPaul M. Wax — UT Southwestern Medical CenterHenry A. Spiller — Kentucky Poison Control CenterMary Ann McGregor — Texas Poison Center NetworkKurt A. Kleinschmidt — Texas Poison Center NetworkDonna L. Seger — Tennessee Poison CenterChristine Murphy — National Capital Poison CenterGwen Wurm — Oregon Poison Center

David Trinklein — University of Missouri ExtensionKaren Funkenbusch — University of Missouri ExtensionRalph Whitesides — Utah State University ExtensionCorey Ransom — Utah State UniversityBret A. Scasta — University of WyomingKeith Johnson — Purdue University ExtensionDebra Hagstrom — University of Illinois ExtensionTom Dudek — University of Arizona Cooperative ExtensionMaryline Seigler — University of FloridaStephen L. Welsh — Brigham Young University

Craig A. Schmutz — University of SaskatchewanDavid W. Hulbert — University of QueenslandCaroline Veresoglou — Freie Universität BerlinDaniel J. Kliebenstein — University of California, DavisMark A. D. Goodwin — University of GeorgiaJames A. Duke — USDAJulia F. Morton — University of MiamiLawrence Kaplan — University of Massachusetts BostonPeter A. Cock — Australia (Plant Toxins Research)

Robyn M. Gleadow — Monash UniversityIan E. Cock — RMIT UniversityPhilippa M. Forrester — University of SydneyMary T. Fletcher — The University of QueenslandRobert J. Petroski — University of Queensla