Invasive species are plants, animals, or other organisms that are not native to an area and spread rapidly, causing damage to our local environment and economy. Invasive plants are a big problem in Arcata. They harm the look and function of our landscapes, recreation areas and waterways.
Please help the City to control them and protect our natural environment. Know what they look like and do your best to control them at home. Always clean your shoes, gear, pets, and vehicles after recreating, especially in bodies of water. Help protect our open spaces by joining an invasive plant removal workday or organizing your own!
Invasive Weeds of Humboldt County Booklet
Learn more about local invasive plants with the 3rd Edition Guide for Concerned Citizens!
Red Alert Species Lists
The plant species pictured below are 'Red Alert' species, meaning they are relative newcomers with limited distribution. Take the list with you with this printable PDF of the 9 Red Alert species.
Quick response is the most cost-effective way to control their spread. If you see any of these invasive species, please call the Humboldt County Department of Agriculture at 707-441-5260 or email agcommissioner@co.humboldt.ca.us to report your sighting.
The City of Arcata is also a partner in the Humboldt Weed Management Area. More information can be found here!