Bishop's (Gout) Weed turning brown

I have quite a nice border of bishop's weed as a ground cover with my
yews.  Every year it looks beautiful and then suddenly it starts to turn
brown (rust?) and before long it looks so ratty that I mow it down.
Just this week it has started turning brown.  I am hoping some of you
very experienced garderners may know what the problem is and how I can
stop  it!  All advice will be appreciated.

Diana
Eastern Michigan-upper lower penninsula--zone 5







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