I think you are just seeing them get ready for frost and dormancy. I leave the stems with seedheads up intact, for birds to feed on, into very late fall or mid-winter, even, but if they are too unsightly, cut them down. If the blackness was early in the season, let me know, but I think at this late date this is normal.
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Welcome! I’m Margaret Roach, a leading garden writer for 25 years—at ‘Martha Stewart Living,’ ‘Newsday,’ and in three books. I host a public-radio podcast; I also lecture, plus hold tours at my 2.3-acre Hudson Valley (NY) Zone 5B garden, and always say no to chemicals and yes to great plants.