Non-native & invasive mature Princess Trees are in full bloom currently in Philadelphia.
I may have mentioned it before, but just early colonization of an empty urban space isn’t always enough. There’s a threshold that has to be reached before the weeds can relax, and be considered assimilated; no longer seen as an eyesore. Several of the specific weeds previously seen on Urban Flora have since been removed (Common Mullein on Spring Garden, Curly Dock on 2nd Street, for example), having outlived their welcome — possibly not picking the most discreet space, or daring to grow a little too quickly in early spring.
This Princess Tree (of the Paulownia genus) has surpassed the time of risking destruction. Especially during the brief blooming period in April, chopping down a tree this large would draw negative attention - it has made it in Philly.