My wife says those yellow things are just “river weeds”. The do seem to be drought resistant and maintenance free. Since they aren’t costing me anything in time or money maybe I’ll just let them be. Plus, the wife don’t like them. More reason to keep them.
I’ve chopped those roses down 3 or 4 times now and they just keep coming back twice as thick. Since I don’t care to dig up the roots, they may get a pass too.