“I think that’s what I have here in Northern Virginia. Quite a mess, never fills in enough to be a real lawn, spreads everywhere, hard to kill.”
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Are you referring to Bermuda? I think N.VA is probably a bit far north for optimum growth.
Yes, the very narrow blades of Bermuda can be resistant to the
contact herbicides that act through the blade or leaf.
It may not be optimum, but it grows. Then it seems to head straight for some garden area like my irises. At some point I am going to have to dig out the irises, pick out every bit of grass root, change over the dirt and put the irises back. Not sure where the grass came from, it was there when I moved in.