Researchers believe the truffle, mostly found in northern Spain, southern France and northern Italy, was able to grow in Wales due to climate change.
It was grown in Monmouthshire as part of a project run by truffle firm Mycorrhizal Systems and was harvested in March by a trained dog named Bella.
The aromatic fungus was growing in the root system of a Mediterranean oak tree that was planted in 2008 and treated to encourage truffle production.
It had been inoculated with truffle spores and the surrounding soil was made less acidic by treating it with lime.
Further microscopic and genetic analysis confirmed that Bella’s find was a Perigord black truffle (Tuber melanosporum).
Dr Paul Thomas, of Mycorrhizal and the University of Stirling, said: “This cultivation has shown that the climatic tolerance of truffles is much broader than previously thought, but it’s likely that it’s only possible because of climate change, and some areas of the UK – including the area around Cambridge – are now suitable for the cultivation of this species.”
The black truffle is one of the world’s most expensive ingredients, worth as much as £1,700 a kilogram, but its Mediterranean habitat has been affected by drought due to long-term climate change, and yields are falling while the global demand continues to rise.
“This is one of the best flavoured truffle species in the world and the potential for industry is huge,” said Dr
“We planted the trees just to monitor their survival, but we never thought this Mediterranean species could actually grow in the UK – it’s an incredibly exciting development.”
A study by the firm and Cambridge University has been published in the journal Climate Research and suggests truffle cultivation may be possible in many parts of the UK.
The first truffle to be cultivated in the UK was a burgundy truffle in Leicestershire in 2015. This is the first time the more valuable black Perigord truffle has been cultivated in such a northern climate.