Patrick Blanc looking at Heuchera parvifolia growing on a bare rock surface, Colorado, USA, Sept. 2015
Patrick Blanc climbing along the stairs encircling the supposed oldest oak of France, a 1 200 years old estimated Quercus robur, Allouville, Normandy, France, Sept. 2015
Patrick Blanc inside the supposed oldest oak of France, a 1 200 years old estimated Quercus robur, Allouville, Normandy, France, Sept. 2015
Patrick Blanc in the supposed oldest oak of France, a 1 200 years old estimated Quercus robur, Allouville, Normandy, France, Sept. 2015