© Getty Images

Grand Cascade - The Garden is home to the Grand Cascade, an enormous fountain containing 120 water jets.

© Shutterstock

Alnwick Garden - The Alnwick Garden is a complex of gardens around Alnwick Castle in the historic market town of Alnwick in Northumberland, England.

© Shutterstock

Alnwick treehouse - At the Alnwick Garden, you'll also find one of the largest wooden treehouses in the world.

© Shutterstock

Who created the Poison Garden? -

Behind these gates, you'll find the Alnwick Garden's most intriguing tourist attraction. The Poison Garden was started in 2005 by Jane Percy, Duchess of Northumberland.

© Shutterstock

Inspiration - The Poison Garden was inspired by the Orto Botanico di Padova, a botanical garden in Padua, Italy.

© Shutterstock

Visitors - Visitors must follow specific instructions when visiting the garden.

© Shutterstock

Visiting the garden - Visitors are not allowed to touch, smell, taste, or even stand too close to these plants.

© Shutterstock

Visiting the garden - Visitors can only go in as part of a guided tour. These have a limit of 20 people, so that the guide can supervise everyone.

© Shutterstock

Caged plants - Some plants are so dangerous that they're secured in cages.

© Shutterstock

Trained gardeners - Gardeners are specially trained to tend to the garden. They have to wear gloves and even masks when dealing with certain plant species.

© Shutterstock

Ricinus - This plant, commonly known as the castor bean or castor oil plant, contains the lethal poison ricin. It's one of more than 100 deadly species that can be found in the Poison Garden.

© Shutterstock

Hemlock - This highly poisonous plant also adorns the Poison Garden.

© Shutterstock

Ruta graveolens - Commonly known as rue, this plant can give you a rash if you touch it.

© Shutterstock

Belladonna - Belladonna, also known as deadly nightshade, can also be found in the Garden.

© Shutterstock

Laburnum - All parts of laburnum, also known as golden chain or golden rain, are toxic.

© Shutterstock

Brugmansia - Also known as angel's trumpets, these eye-catching flowers are, in fact, poisonous.

© Shutterstock

Hellebore - Hellebore is another beautiful yet toxic flowing plant that can be found at the Poison Garden.

© Shutterstock

Foxglove - Inhaling the pollen of this flower can be enough to trigger poisoning symptoms.

© Shutterstock

Vinca rosea - Also known as the Madagascar periwinkle, this plant is actually used in chemotherapy.

© Shutterstock

Nux vomica -

Otherwise known as the strychnine tree, ingesting its seeds can have harmful effects.

© Shutterstock

Euphorbia -

Euphorbia, or spurges, are highly toxic. Touching them can give you a nasty rash.

© Shutterstock

Vinca major - Also known as greater periwinkle, this plant has been used to treat low blood pressure.

© Shutterstock

Drug awareness - The aim of the Poison Garden is also to create awareness of the dangers of illicit drugs.

© Shutterstock

Tobacco - Tobacco, which is used in harmful products such as cigarettes, is also planted at the Poison Garden.

© Shutterstock

Cannabis - Cannabis sativa plants are seen here at the Poison Garden. The warning sign is quite appropriate.

© Shutterstock

Coca - Coca plants are planted as part of the awareness against drug use.

© Shutterstock

Opium poppy -

The plant, used as the base for the production of drugs such as heroin, can also be found at the Poison Garden.

See also: Poisonous plants and flowers found in nature

© Shutterstock