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. Help protect our open spaces by joining an invasive plant removal workday or organizing your own!
The plant species pictured below are 'Red Alert' species, meaning they are relative newcomers with limited distribution. 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 email@example.com to report your sighting. The City of Arcata is also a partner in the Humboldt Weed Management Area. More information can be found here!
Red Alert Species
Keep an eye out for these 8 invasive plants!
Gorse (Ulex europaeus)
Tree-of-Heaven (Ailanthus altissima)
Shiny Geranium (Geranium lucidum)
Purple Loosestrife (Lythrum salicaria)
Japanese Knotweed (Reynoutria japonica)
Spotted Knapweed (Centaurea stoebe ssp)
Diffuse Knapweed (Centaurea diffusa)
Himalayan Knotweed (Persicaria wallichii)
Report your sighting to the Humboldt County Department of Agriculture: