One of our experimental sites this summer is the “Quai des Plantes” or “vegetated dock”, located on the Loire river banks in Nantes. Offering a plant nursery, a green promenade and a place for gathering, leisure and festivities, this very mineral site (a former parking lot built on the top board of a reinforced-concrete dock) has been redeveloped over 500 m since the summer of 2017. Today, 1,500 trees planted in pots constitute the perpetual heart of the site, before being planted in the parks and public gardens of the city of Nantes. This ephemeral and dynamic installation revives its historic vocation of transitioning plants coming by colonial ships to the garden of French apothecaries. The transitory nature is also reflected in the desire to transform sustainably the Loire docks into a green axis between the city center and the public transport stop “Gare Maritime” and the lower Chantenay district.