Locked behind black steel doors in Northumberland, England, the Poison Garden at Alnwick Castle grows around 100 infamous killers. From deadly nightshade to hemlock, the only way a plant can take root in this garden is if it is lethal to humans. Created by the Duchess of Northumberland, this is one garden where you won't want to stop and smell the flowers.

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This story is a part of our Planet Earth series. From mammals to insects and birds to reptiles, we share this great big world with all manner of creatures, large and small. Come with us to faraway places as we explore our great big planet and meet some of its wildest inhabitants.

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