“...will regrow from any bit of root left in the ground...)
I’m convinced that aerating machines are just Bermuda grass pluggers. Whatever ungodly collection of weeds the equipment renter before you had in THEIR yard...is now plugged into YOUR yard. Usually, it’s Bermuda grass plugs.
I believe it. A variety of grass I’ve always wondered about is zoysia. I’ve seen the ads claiming that it fills in from planted plugs and then is incredibly hardy, and my first thought was that I don’t want anything like that in my yard. Where we used to live, it was tough enough trying to keep the Bermuda grass under control in the garden and flowerbeds. That and morning glories — I curse the idiot who planted morning glories in that yard. Rip the vines up time after time, and they’re back in a few weeks.
Mint is another unkillable plant, but it doesn’t spread too badly.