REPORT

Invasive Plant Details

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Tansy 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.