Regarding eucalyptus, as a native Californian, I totally get where you are coming from. They are amazing, and often beneficial trees.

But, as a fourth-generation conservationist, I would never knowingly propagate eucalyptus on the West Coast of the U.S. Or, really, anywhere in the U.S.

The fact that a plant or tree has beneficial qualities does not automatically make it a great idea for wherever it happens to be growing, as it may well be outcompeting native species that are even more beneficial for their current locale.

Every space needs to be considered on its own merit, and each species being considered for said space needs to be considered accordingly.

For the record, my husband and I own a small building lot in northern New Mexico, which we purchased because of my great love for the area, and my memories of great vacations taken nearby with my grandparents when we were kids. I'll be happy to share what I know.

Good luck.