Spoke with the city's Parks and Wildlife arborist this morning. I noticed they were out in my front yard at 7AM.
It seems that I have a very rare ash tree that is NOT infested with emerald ash borer as with 99% across North America seem to be.
The forestry service is cutting them down by the millions to affect the borer pandemic. They are watching mine closely.
I was told that they had been out twice to this neighborhood cutting down ash trees, mine has been flagged, but so far, no reason to cut it down.
OK, if my ash tree becomes infested, that will make two trees in my front yard the city is going to destroy.
When I asked what I could do to ensure that my ash tree stays healthy, he only said that he wished he knew. Some spray them with NEEM oil. I objected, told him I use NEEM on my roses and it is not an insecticide but a fungicide.
He had no answer.