Langs vele doorgaande stadswegen bloeit op het moment uitbundig een exoot: het bezemkruiskruid (Senecio inaequidens). In haar prachtige boek Lab Girl (uit 2016) schrijft Hope Jahren:
‘A plant that thrives where it should not live is a weed. We don’t resent the audacity of the weed, as every seed is audacious; we resent its fantastic success. Humans are actively creating a world where only weeds can live and then feigning shock and outrage upon finding so many. But there is already a revolution taking place in the plant world, as invasives effortlessly supplant natives within every human-modified space. We aren’t getting the revolution we want: we’re getting the revolution that we triggered.’