Duchess of Northumberland Jane Percy has revealed that she has been struggling to secure coca seeds or seedlings for her Poison Garden at The Alnwick Garden, for almost ten years.

She has received special approval from the British Government to grow some of nature's deadliest plants within the secure garden including opium poppies, cannabis and coca plants.

But sourcing the coca seeds, known worldwide for its psychoactive alkaloid, cocaine, has proven to be more challenging than anticipated.

Having continuously reached out to British Embassies in Peru, Bolivia, Chile and Columbia, the attempts at sourcing the seeds to date have proved futile.

She said: “Although we have a Government licence to grow Coca, we have been unable thus far to be able to source the plant.

“For many years we have run a drugs education programme which provides a unique opportunity to think about the plants that drugs come from and the dangers those drugs present.

“Unfortunately we are missing the part of the story which explains the pain and suffering in the countries where Coca is grown and cocaine is processed.

“The Poison Garden has always pushed the boundaries of drug education and we are proud to be different and showcase some of the world’s deadliest plants.”

The Poison Garden is home to 100 varieties of toxic, intoxicating and narcotic plants that range from the exotic Brugmansia, which can kill those who ingest it with high levels of scopolamine and atropine, to the Laurel hedge, a common plant that emits toxic fumes.

It also welcomed the world’s most venomous plant Gympie Gympie last year to critical acclaim.

The boundaries of the Poison Garden are kept behind black iron gates, only open for guided tours.

The combination of dark, ivy-covered tunnels and flame-shaped beds creates an educational garden full of interest and intrigue, where the most dangerous plants are kept within giant cages so that experienced guides can take visitors through an informative commentary about each plant along with historical, high-profile poison anecdotes.

Visitors can learn about the poisonous plants but are strictly prohibited from touching them.

Despite the struggle to obtain coca seedlings for the Poison Garden, The Duchess remains optimistic.

“I truly believe anything is possible and I will continue to tackle this problem head-on and liaise with the Colombian Embassy.

"Our priority is to do so safely and legally for our own education purposes and we believe we will be announcing the safe delivery of the seedlings in the not-too-distant future,” she added.