There's also the Berlin Tree Register[1] mapping which looks like every public tree in the city.

And while we're at it, the city's official Geoportal Berlin[2] is a treasure trove of open geo data.

[1] https://www.arcgis.com/home/item.html?id=05c3f9d7dea6422b86e...

[2] https://fbinter.stadt-berlin.de/fb/index.jsp