I have broadleaf Arrowhead, maybe it's called Arrowroot, I can't remember.
It's a dense bulb growth that is taking over areas of my property. I have
tried everything from Roundup, to Crossbow, to Diesel (yes, I was willing
to try anything). The look sick afterword, but don't die.

What will actually KILL these bulbs once and for all instead of digging
them? Digging isn't an option.

Thanks for your guidance!
-Brendan