Plants travel according to their desires, without worrying about landscape plans or concrete boundaries. They live in the cracks of our cities. Useless or from elsewhere, these out-of-control grasses have been categorized as “mauvaises herbes” (weeds translate to « bad plants » in French). It is essential to reconnect urban citizens with the living. With three poetic cartographies and an edition, I am on a journey to meet these vagabonds, often invisible to our eyes.