
Hard and bumpy brown protuberance on the tree. New England.

Hard and bumpy brown protuberance on the tree. New England.
Zone 6A. Northeast facing balcony.
I'm on the top floor (4th) and the mid morning sun hits just right to make the sun come through the railings and cast a shadow, like shown in the picture, would you consider those hours shade or sun? The early morning and late morning/early afternoon sun all hit the spots shown directly.
The railing plants get sun morning to afternoon (no railings to filter sun), but asking to see if I need to potentially set up differently for the Eutrochium (shown) and Monarda (not pictured). Also adding some for plants this week that are more shade-tolerant. Thanks in advance!
(Zone 6A)
Last year I bought an already bushed up (right before flowering) Monarda and it had two main stalks (picture 2). It, along with the Eutrochium, are now happily in bigger pots than the ones shown in picture 2 (New pots: 14" diameter x 11" H).
This spring the Monarda has about ~15 different seedlings (picture 1). Way more than last year's plant. If they all successfully grow this seems like it would be way too much for the pot. Do I cull some? Or can I get some sprouts out safely and repot them in a different pot/give them away? (Not sure if that's possible with a plant that spreads via rhizomes). If that is possible what's the best way to go about doing it to minimize harm to the main plant and the sprouts?
It's damn annoying. And no, it's not the hinges. Its friction from the top exterior weatherstripping when it makes contact with the door frame. The weatherstripping is not torn up or raised, it's flush to where it should be.
Anyone got a fix?