V posebej označenem delu parka The Alnwick Garden je za visoko ograjo območje, kjer gojijo najbolj strupene rastline na svetu.
A garden featuring intoxicating and poisonous plants was added in February 2005. Species of the Poison Garden include Strychnos nux-vomica (source of strychnine), hemlock, Ricinus communis (source of harmless castor oil but also deadly ricin), foxglove, Atropa belladonna, Brugmansia, and Laburnum.
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