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Broom plants flourishing on Mount Tamalpais near San Francisco are a growing problem, and the root cause of why the Marin Water District is considering doing away with the herbicide ban in the area.
The plants can create a fire hazard, and according to vegetation ecologist for the Water District Janet Klein, they?EUR??,,????'?????<???EUR?re spreading fast. ?EUR??,,????'?????<?They can grow to be 12 feet in height. They?EUR??,,????'?????<???EUR?re extremely prolific, so one plant will produce 8,000 seeds that remain viable in the soil for 50 or, one study said 80 years,?EUR??,,????'?????<? she said.
?EUR??,,????'?????<?We?EUR??,,????'?????<???EUR?re falling further and further behind every year. We estimate that it?EUR??,,????'?????<???EUR?s spreading on our lands at a rate of about 60 acres a year and that rate accelerates every single year.?EUR??,,????'?????<?
The plants are already beginning to choke fuel breaks, which causes trouble for firefighters in the event of a wildfire. The district is reviewing a number of alternatives to using herbicides, which the board banned in August of 2005 due to complaints about health issues. They include mulching, hand pulling, propane flaming and mowing.
Source: KCBS
Francisco Uviña, University of New Mexico
Hardscape Oasis in Litchfield Park
Ash Nochian, Ph.D. Landscape Architect
November 12th, 2025
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