raizn4kids wrote:

I moved to my lot about seven years ago and had the property cleared. I
seeded w/ grass and kept the trees that I wanted. I have a barrier of pine
trees between me and my neighbor, with a few Holly trees in the mix. Last
year a volunteer Mimosa tree sprouted. I pulled up the small tree, and
thought, well, that is that...

My guess is there is a nearby tree whose seeds are being blown in your
direction. Why not call your county agent for advice?

Dick