Property line/tree neighbor question

[Janit]

When you do approach your neighbor about this again, it would be best to take the stance of an ally rather than of an adversary. All your research can be used for this purpose, and you may even be able to throw some shade on the tree-planting organization in service of your neighborly relations. (See what I did there?)

Was a Sweetbay Magnolia a more suitable tree for this site? Did the tree-planters make a mistake? What else did they say they planted in the area, and what did they actually plant?

I am not suggesting you outright throw the tree-planters under the bus, but if you can make this into a shared problem, you are likely to have a better outcome.