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Invasive Weeds of SLO County

 

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The weeds described on this website are some of the worst invaders occurring in San Luis Obispo County, but are by no means an exhaustive list of our troublesome plants. For more information on the following weeds contact the San Luis Obispo County Agriculture Department, San Luis Obispo County Farm Bureau, the Farm Advisor's office (U.C. Cooperative Extension), or other local groups concerned about invasive plants.
 
Artichoke Thistle – Cynara cardunculus  

Arundo or Giant Reed – Arundo donax

Barb Goatgrass – Aegilops triuncial 

Cape Ivy – Delairea odorata

French Broom – Genista monspessulana

Hoary Cress – Cardaria spp.

Jubatagrass – Cortaderia jubata

Medusahead – Taeniatherum caput-medusae

Oblong Spurge – Euphorbia oblongata

Pampasgrass – Cortaderia selloana

Perennial Pepperweed – Lepidium latifolium

Purple Starthistle – Centaurea calcitrapa

Spanish Broom – Spartium junceum

Tree of Heaven – Ailanthus altissima

• Veldt Grass – Ehrharta calycina

Wooly Distaff Thistle – Carthamus lanatus

Yellow Starthistle – Centaurea solstitialis

 

Other Invasive Plants in San Luis Obispo County: 

• Bull Thistle - Cirsium vulgare

• Castor Bean - Ricinis communis

• European Beachgrass - Ammophila arenaria

• Ice Plant - Carpobrotus edulis

• Italian Thistle - Carduus pycnocephalus

• Periwinkle - Vinca major

• Poison Hemlock - Conium maculatum

• Puncture Vine - Tribulus terrestris

• Russian Knapweed - Acroptilon repens

• Russian Thistle - Salsola tragus

• Saltcedar/Tamarisk - Tamarix species

• Skeleton Weed - Chondrilla juncea

• Tocalote - Centaurea melitensis

• Wild Fennel - Foeniculum vulgare

• White Horsenettle/Silverleaf Nightshade - Solanum elaeagnifolium