Ability to Respond Total:10 / 25Ability to Respond = ( Ease of Response + Tools in Place )
Confidence:High
Confidence Notes:We have a very good understanding of how this species spreads and behaves. It has been spreading aggressively in Southern California for over two decades.
Impact
Spread
Notes
Score
Spread Rate
Has spread widely across Southern California since introduction in early 1980's. Individual populations spread aggressively. It has since spread to Arizona, northern Mexico and Nevada
5
Spread Amount
It is a habitat generalist, occurring in coastal, desert, foothill, and inland areas. In California and Australia it invades agricultural lands including small grains and livestock pasture.
5
Damage
Notes
Score
Ecological
Small infestations eventually become the dominant plant species. In some cases it can outcompete annual grasses. Clusters of plants are dense forming near monotypic stands. Increases fine flashy rules altering fire regime in desert, inland, coastal areas
5
Agricultural
Causes moderate losses in agriculture in Australia, and observations are similar in California. Reduces forage for livestock in rangelands as well. It is not palatable to livestock.
3
Infrastructure
0
Cultural
Can outcompete more showy wildflowers, like poppies, lupines and goldifelds, and reduce spring wildflower tourism in local areas.
2
Health
0
Benefit
Notes
Score
Ecological
none known
0
Agricultural
none known
0
Infrastructure
0
Cultural
0
Health
0
Total
20
Ability to Respond
Ease of Response
Notes
Score
Detection
When flowering relatively easy to detect. When in rosette stage it is difficult to detect especially if growing near other herbaceous annuals.
3
Control
Relatively difficult to control. Individual plants can be controlled with chemical or physical methods. But populations are difficult to control owing the dense stands and large numbers of plants of different sizes.
3
Tools in Place
Notes
Score
Entry
CDFA "Q" rated
1
Control
Southern California land managers are generally aware of this species
1
Outreach
Outreach efforts are ongoing but not coordinated across all of Southern California
