Originally Posted by marlin78
Will it kill an oak next that's growing couple inches from it?


It depends on chemistry used and as k bush said, how sloppy you are. Generally when I see injury to nearby vegetation, it is either 1) root exudates 2) too much applied to hack area and you get runoff in the next rain and roots take up a soil active herbicide like imazapyr or 3) you habe root grafting between same species. Root grafting really isn’t a concern across species.

If you do the things you need to do when you need to do them then someday you can do the things you want to do when you want to do them.