Tough. My family came to El Cajon five generations ago. I have a very good idea what the situation is.
It would cost billions, and take an army of hundreds of thousands, all armed with weed eaters and machetes, and it would take them 20 years to do it.
Only a total moron or a socialist bent on playing games (but I repeat myself) would do it that way.
And then when done, it would all grow back in a year or two.
You must be the former.
Cut loose several million goats, or just spay it all with agent orange.
I give up here.