Urban gardens in Paris get a boost after a wild truffle is discovered for first time

The French capital is making a major push towards urban gardening, aiming to have 100 hectares of roof gardens in the next two years, a third of which will be used to grow herbs, vegetables and hops to flavour beer.

French gourmets were celebrating Friday after a wild truffle was discovered for what experts said was the first time ever in Paris. The discovery in a hotel roof garden in the shadow of the Eiffel Tower comes as prices for the aromatic fungus have doubled to more than 5,000 euros ($6,000) a kilo. Coming just before Christmas, when truffles are used to flavour such seasonal foods as foie gras and chestnut soup, it raises the hope of an undreamt-of windfall for the new wave of urban gardeners colonising city roofs.

“The discovery of this wild truffle is a wonderful example of how roof gardens and green roofs have a huge potential for urban biodiversity,” said the Museum of Natural History in the French capital, which revealed the find. It also raised the question of whether the micro-climates roof gardens foster might be particularly favourable for truffles, the museum added. The black “tuber brumale”, which tends to grow in the same regions as its more highly-prized cousin, the Perigord black truffle, was found at the base of a hornbeam tree on the roof of the Mercure Paris Centre Tour Eiffel hotel by Frederic Madre, a researcher from the museum’s centre of ecology and conservation.

A wild truffle, Tuber brumale, was found on the green roof of a hotel in Paris.

Madre is also a co-founder of the Topager startup which was responsible for putting organic gardens on the top of several major buildings in Paris. It plans to add another to the roof of the Opera Bastille. A 600-square-metre (6,450-square-foot) roof garden above the Pullman Paris Tour Eiffel hotel, around the corner from where the truffle was discovered, already supplies that hotel with honey, herbs, salad leaves and some of its vegetables and eggs, with chickens fed on its kitchen leftovers.

Experts from the museum and mushroom specialists from the French Institute of Evolution and Biodiversity are now trying to work out how the truffle got onto the roof, “and if this is a good sign of the health of the Paris ecosystem.” The French capital is making a major push towards urban gardening, aiming to have 100 hectares of roof gardens in the next two years, a third of which will be used to grow herbs, vegetables and hops to flavour beer. Underground car parks are also being turned over to grow mushrooms in beds made from used coffee grinds. More than 70 major companies have already signed up to have the roofs of their offices and buildings converted into vegetable plots.

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