Several urban farms in Paris are struggling to find a viable economic model. Since 2020, around 8 tonnes of salads, tomatoes and other zucchini have grown there each year in ‘gutters’ and ‘towers’ The farm is planted 15 m high, on the roof of hall 6 of the Porte de Versailles Exhibition Center (15th century) “She watches our vegetables grow,” laughs Flore Canonge, responsible for activities on this 14,000 m2 site.