I want a liwuod solution high on Phosphorus that I can spray on this stuff with my tank sprayer and kill it or at least thin it out. I have 5 acres of it that I want to kill, but I want to keep my grass. Is there a product I can buy or can I make a home remedy to do the job.
Herbicides do not work well on Broom Sage.
These links have more information.
I would also suggest you talk with your County Extension Office. They may have some suggestions for control of Broom Sage, specific to your region.