Threadleaf ragwort (Senecio flaccidus)

Threadleaf ragwort

Also known as: Comb Butterweed, Douglas Groundsel, Felty Groundsel, Yerba Cana, Cenicillo, Bush senecio, Smooth threadleaf ragwort, Shrubby butterweed

Also known as the threadleaf ragwort, the Senecio flaccidus is native to the southwestern Great Plains of North America. It's a fast-growing perennial shrub used to achieve a rapid ground cover in order to stabilize the soil for longer-lived perennials.

Scientific classification

Species

Threadleaf ragwort (Senecio flaccidus)

Asters bellflowers fanflowers and allies

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Toxic to Pets

Toxicity

Shrub

Plant Type

Spring, Summer, Fall

Bloom Time

1.4 m

Plant Height

60 cm

Spread

Green, Blue

Leaf Color

8 cm to 10 cm

Flower Size

Yellow

Flower Color

Deciduous

Leaf type

Images of Threadleaf ragwort

Distribution of Threadleaf ragwort

Distribution Map

Threadleaf ragwort is primarily native to the southwestern regions of North America. Its range extends from the arid and semi-arid zones of a major desert area to subtropical areas further south. It has adapted to thrive in these environments, characterized by rocky soils and temperate to warm climates. Introduced populations are not commonly reported, thus it remains mostly within its native distribution zones.

Native

Cultivated

Invasive

Introduced

No species reported

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Habitat

Washes, wooded or shrubby slopes, valley grasslands

Hemisphere Trend Curve

Northern

Sorthern

Culture

Symbolism

Health, Healing

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Care Guide for Threadleaf ragwort

Every 3 weeks

Water

Full sun

Sunlight

5 - 38 ℃

Ideal Temperature

Water: Threadleaf ragwort thrives in semi-arid environments, showing drought tolerance with a preference for dry soil. Water every three weeks, allowing complete drying between sessions. Ideal for xeriscaping and outdoor growth, threadleaf ragwort requires minimal rainfall, making it suitable for water-conserving gardens.

Fertilize: For optimal growth, fertilize threadleaf ragwort with balanced nutrition every 4-6 weeks during spring to fall. Use high-nitrogen fertilizers for poor leaf growth, but avoid over-fertilization. Water-soluble types are recommended, and always water threadleaf ragwort after feeding to prevent root burn.

Pruning: Threadleaf ragwort is a perennial with narrow, threadlike foliage. Prune in early spring to shape the plant and promote growth. Focus on removing dead stems and thinning overcrowded areas for better air circulation. Regular pruning enhances its beauty, reduces pests, and fosters healthier growth.

Propagation: Threadleaf ragwort is a resilient perennial that propagates by sowing fresh seeds in well-draining soil, ideally in containers. Maintain consistent moisture without waterlogging. A warm, stable environment aids germination until seedlings are ready for transplantation into the garden.

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Learn More About Threadleaf ragwort

Sunlight Requirements

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