One of the “questions” concerning the Humboldt Forum that the German Green Party (Fraktion BÜNDNIS 90/DIE GRÜNEN) put before the German Parliament, the “Deutscher Bundestag” on 2 July 2019 was:
Question 22: “What is the current state of the considerations on the part of the Federal Government for the greening of the facades, to install a so-called Humboldt Jungle?”
Publication 19/11306 Answer @ Deutscher Bundestag, German Federal Government, Germany, 2 July 2019