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| Keep in mind scouring rush/horsetail can have rhizomes upwards of 20' down (especially with scouring rush), tillage isn't going to make it happy and get ahead and grow so you can technically try 'starve itself' over years, but probably not realistic. Given some of it is probably rooted from some more historically swampy woods/thickets, it might just be a branching out of rhizomes from a long ways away from where you are spraying/tilling.
The one response to actually inject glyphosate into the hollow stem might be one of those 'ain't got time for that, but it'd be your best bet' solution, otherwise, making it burn or till down might be one of your 'get yourself feeling better for the season, despite probably not doing the most in the long run' kind of solution.
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