Posted 6/9/2021 23:01 (#9050806 - in reply to #9050284) Subject: RE: Killing cat tails
Wisconsin
Cattails are also a perenial with a large rhizome for energy storage. I'd guess that timing of application is critical for glyphosate to work, like quackgrass or canada thistle. Possibly mowing at the right time, then spraying the regrowth at the right time.