Tansy ragwort (Jacobaea vulgaris subsp. vulgaris)

Tansy ragwort

Also known as: Ragwort

Tansy ragwort (Jacobaea vulgaris subsp. vulgaris) is native to Eurasia and has become naturalized in North America as well. Tansy ragwort is usually considered a weed, and can be hard to control in areas of disturbed soil. Alkaloids in the tansy ragwort plant make it relatively toxic to humans and livestock.

Scientific classification

Species

Tansy ragwort (Jacobaea vulgaris subsp. vulgaris)

Asters bellflowers fanflowers and allies

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Biennial, Perennial

Lifespan

Herb

Plant Type

Deciduous

Leaf type

20 - 35 ℃

Ideal Temperature

Images of Tansy ragwort

Distribution of Tansy ragwort

Distribution Map

Tansy ragwort is indigenous to a broad region covering parts of Europe and Asia. Its native range spans across temperate areas of the European continent and extends into the western and central regions of Asia. Additionally, tansy ragwort has been introduced to other parts of the world including significant portions of Australasia and East Asia. Remarkably, the plant has established itself in these new environments outside of its original habitat.

Native

Cultivated

Invasive

Introduced

No species reported

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Care Guide for Tansy ragwort

Every week

Water

Full sun

Sunlight

20 - 35 ℃

Ideal Temperature

Water: Originating from temperate regions, tansy ragwort prefers moderate moisture levels. It requires consistent weekly watering to thrive, mimicking natural rainfall patterns in its climate zone. While often grown outdoors, it neither needs constant dampness nor is particularly drought-tolerant.

Fertilize: For tansy ragwort, use a balanced fertilizer, especially high-nitrogen, during early growth. Fertilize biannually—early spring and mid-summer—while avoiding over-fertilization to protect tansy ragwort and the environment. Adjust amounts in late summer for dormancy preparation, and wear gloves during application for safety.

Pruning: Tansy ragwort features bright yellow flowers and feathery leaves. Pruning in early to late spring promotes healthier growth and discourages invasiveness. Key techniques include removing damaged wood, thinning for air circulation, and deadheading for continuous blooms, enhancing its ornamental value.

Propagation: Tansy ragwort is an aggressive perennial weed requiring careful control. Seeds should be shallowly sown in well-drained, fertile soil, kept moist, with seedlings thinned to prevent overcrowding. Selective propagation helps manage its invasiveness while maintaining its ecological role.

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