Invasive Plant Details
Back to Full ListTansy Ragwort
Latin Name: Senecio jacobaea
Priority Ranking: High Priority
Identification
Flower: Small, bright yellow, daisy-like flowers in dense clusters that bloom from midsummer to fall.
Leaves: Deeply lobed, dark green, and slightly hairy.
Stems: Erect, branching, and slightly hairy, growing up to 1 meter tall.
Growing Environment: Prefers well-drained soils in pastures, roadsides, and disturbed areas.
Growth Habit: A biennial or short-lived perennial herb that spreads by seeds, forming dense patches in open areas. In situ, tansy ragwort appears as tall, yellow-flowered plants in disturbed areas and pastures.
Priority Ranking: High Priority
Impacts on Environment
Impacts: Highly invasive in pastures and disturbed areas, rights-of-ways where it forms dense colonies.
Toxicity: Highly toxic to livestock, particularly cattle and horses, due to pyrrolizidine alkaloids.
