Last year started with glyphosate, it all looked dead but slowly started to grow again. Spot sprayed it many times. Sprayed entire area 5 times, still new stuff coming up very, very slowly. Did some reading on the subject. Now fertilized it with only nitrogen and watered. It's coming up fast now, almost time for more roundup. Hopes are for the nitrogen to make lots of new growth only up top so the roundup can then kill the weakening roots, tubers, and whatever else makes this stuff grow like the national debt.
Still fighting, Tony