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 University Richard Walter — Colorado State University James Pfister — USDA-ARS Poisonous Plant Research Laboratory Bryan Stegelmeier — USDA-ARS Poisonous Plant Research Laboratory Michael Ralphs — USDA-ARS Poisonous Plant Research Laboratory Dale Gardner — USDA-ARS Poisonous Plant Research Laboratory Kip Panter — USDA-ARS Poisonous Plant Research Laboratory Benedict Green — USDA-ARS Poisonous Plant Research Laboratory Kermit Price — USDA-ARS Poisonous Plant Research Laboratory Clinton Stonecipher — USDA-ARS Poisonous Plant Research Laboratory

Kevin D. Welch — USDA-ARS Poisonous Plant Research Laboratory Daniel Cook — USDA-ARS Poisonous Plant Research Laboratory Scott Larsen — USDA-ARS Poisonous Plant Research Laboratory Jennifer Colvin — USDA-ARS Poisonous Plant Research Laboratory Tracy McCluskey — USDA-ARS Poisonous Plant Research Laboratory Lynn James — USDA-ARS Stephen B. Lee — USDA-ARS Derek Bailey — USDA-ARS Michael H. Smith — USDA-ARS Daniel R. Gardner — USDA-ARS

Elizabeth A. Dauncey — Royal Botanic Gardens, Kew Nicola Bates — Veterinary Poisons Information Service Sally Bradberry — National Poisons Information Service Simon Thomas — National Poisons Information Service Allister Vale — National Poisons Information Service Michael J. Balick — New York Botanical Garden Lewis S. Nelson — Rutgers New Jersey Medical School Richard D. Shih — Weill Cornell Medicine Noah Whiteman — University of California, Berkeley Sonny Larsson — Uppsala University

Sarah Lister — ASPCA Animal Poison Control Center Ahna Brutlag — Pet Poison Helpline Justine Lee — Pet Poison Helpline Tina Wismer — ASPCA Animal Poison Control Center Steven Hansen — Pet Poison Helpline Timothy J. Evans — University of Illinois Rebecca H. McClanahan — University of California, Davis Philippa A. Smith — Royal Botanic Gardens, Kew Eimear M. Nic Lughadha — Royal Botanic Gardens, Kew William Milliken — Royal Botanic Gardens, Kew

Edward P. Krenzelok — Pittsburgh Poison Center Robert S. Hoffman — NYU Grossman School of Medicine William Banner — Oklahoma Center for Poison & Drug Information Paul M. Wax — UT Southwestern Medical Center Henry A. Spiller — Kentucky Poison Control Center Mary Ann McGregor — Texas Poison Center Network Kurt A. Kleinschmidt — Texas Poison Center Network Donna L. Seger — Tennessee Poison Center Christine Murphy — National Capital Poison Center Gwen Wurm — Oregon Poison Center

David Trinklein — University of Missouri Extension Karen Funkenbusch — University of Missouri Extension Ralph Whitesides — Utah State University Extension Corey Ransom — Utah State University Bret A. Scasta — University of Wyoming Keith Johnson — Purdue University Extension Debra Hagstrom — University of Illinois Extension Tom Dudek — University of Arizona Cooperative Extension Maryline Seigler — University of Florida Stephen L. Welsh — Brigham Young University

Craig A. Schmutz — University of Saskatchewan David W. Hulbert — University of Queensland Caroline Veresoglou — Freie Universität Berlin Daniel J. Kliebenstein — University of California, Davis Mark A. D. Goodwin — University of Georgia James A. Duke — USDA Julia F. Morton — University of Miami Lawrence Kaplan — University of Massachusetts Boston Peter A. Cock — Australia (Plant Toxins Research)

Robyn M. Gleadow — Monash University Ian E. Cock — RMIT University Philippa M. Forrester — University of Sydney Mary T. Fletcher — The University of Queensland Robert J. Petroski — University of Queensland John M. Coleman — CSIRO Ralph D. Tanner — CSIRO Andrew W. Poulsen — CSIRO John A. Sutherland — University of Adelaide Peter J. McGee — University of New England

Bryan G. Fry — The University of Queensland Alan L. Hart — University of Oxford Mark W. Gurnell — University of Cambridge David J. Watson — University of Tasmania Ian D. Rae — Monash University John M. Jacobsen — Montana State University Wendy C. Weedon — University of Florida

Karin L. Wieringa — Wageningen University & Research Rohan A. Davis — The University of Queensland Vicki A. L. Mellick — University of New South Wales Paul G. Jones — University of Reading Nigel J. C. Veitch — Royal Botanic Gardens, Kew Monica F. M. Gruber — University of Bristol Anne Osbourn — John Innes Centre Michael Heinrich — UCL School of Pharmacy Christine A. Smart — Cornell University