2024 OC Emergent Invasive Plants
This list represents the 2024 prioritization of the newest and potentially most environmentally disruptive non-native plant species in Orange County. This list is specific to non-native, naturalized plant species in Orange County, with very small populations, which also have a high probability of causing significant environmental damage and loss of biodiversity. These species are small enough populations, where complete control and extirpation is still feasible.
New detections, updates, or corrections should be reported to firstname.lastname@example.org.
For information about the methodology for scoring, candidate species, and change highlights, read the “Emergent Invasive Plants in Orange County – A 2024 Update and Priority List” by Ron Vanderhoff.
THE 2024 OC EMERGENT INVASIVE PLANT LIST
Genista monspessulana – FRENCH BROOM
Cenchrus longispinus – MAT SANDBUR
Osteospermum calendulaceum – STINKING ROGER
Cenchrus echinatus – SOUTHERN SANDBUR
Volutaria tubuliflora – EGYPTIAN KNAPWEED
Chrysanthemoides monilifera ssp. monilifera – BITOU BUSH
Hypericum canariense – CANARY ISLAND ST. JOHN’S WORT
Centaurea diluta – SPOTTED KNAPWEED
Parthenium hysterophorus – SANTA MARIA FEVERFEW
Dipogon lignosus – OKIE BEAN
Euphorbia terracina – GERALDTON CARNATION WEED
Centaurea solstitialis – YELLOW STARTHISTLE
Rubus armeniacus – HIMALAYAN BLACKBERRY