Janet Klein, a vegetation specialist with the district, says flammable, invasive broom is replacing areas once inhabited by oaks. David Briggs

Janet Klein, a vegetation specialist who lives and works in Fairfax, says the San Geronimo Ridge—once a diverse forest of oak and Douglas fir as well as home to all kinds of birds and animals—is slowly being overtaken by a nasty and seemingly intractable weed.

“It’s a disheartening situation,” Ms. Klein said. “This patch . . .

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