Dec 30, 2018
By Cristina Goulart
Give them an inch and they’ll take an acre…as the California Invasive Pest Council says. There are a whopping 195 invasive plant species in Sonoma County. In the northwestern forest region which includes Mendocino County, 265 invasive species have been identified. An invasive plant species is non-native and aggressively out-competes native species! In other words, they spread fast and crowd out other plants, harming ecosystems and impacting water quality. Native plants provide shelter and food for native insects, birds, and animals. Invasive species tend not to have habitat value. In fact, they sometimes destroy the very habitats native species need to survive.
One of the most damaging invasive plants is invasive Ludwigia or water primrose. Water primrose is a lovely, floating plant with delicate yellow flowers and is a favorite for artificial ponds and aquariums. Unfortunately, several subspecies of water primrose (Ludwigia hexapetala and Ludwigia peploides) are aggressively invasive and among the most concerning of the invasive species for water quality and stream health. Invasive Ludwigia grows quickly and thickly on water surfaces, blocking out light, using up the oxygen and choking out other life. When invasive Ludwigia covers a water body surface, aquatic birds cannot penetrate the thick mat of Ludwigia with their beaks to hunt for food. Ludwigia also depletes the oxygen in the water body it covers, so that the oxygen is no longer available for fish and other life.
Arundo donax (Giant Reed) grows best along streambanks. It was introduced for erosion control because it quickly covers exposed soil. Unfortunately, that very quality that is useful for erosion control, makes it an invasive species, crowding out native plant species, and reducing habitat value for birds and other animals. Arundo has another huge drawback – it is highly flammable, speeding the spread of wildfire.
Many local organizations and agencies need volunteers to help with invasive plant removal including:
Sonoma County Parks - https://parks.sonomacounty.ca.gov/Support/Volunteer/Opportunities/
The Laguna de Santa Rosa Foundation- www.lagunafoundation.org/volunteer.html
Sonoma Land Trust - www.sonomalandtrust.org/join_in/volunteer.html
Pepperwood Preserve - www.pepperwoodpreserve.org/get-involved/volunteer/
Mendocino Land Trust - http://MendocinoLandTrust.org
This article was authored by Cristina Goulart, of the Town of Windsor, on behalf of RRWA. RRWA (www.rrwatershed.org) is an association of local public agencies in the Russian River Watershed that have come together to coordinate regional programs for clean water, habitat restoration, and watershed enhancement.
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