Hoary Ragwort (Jacobaea incana)

Hoary Ragwort

Jacobaea incana

Silvery woolly foliage contrasts with bright yellow blooms, a hardy temperate wildflower. Common name: hoary ragwort.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; thrives in open meadow conditions and tolerates dry, exposed sites
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Watering Water deeply when the top 2–3 cm of soil is dry; drought-tolerant once established, avoid overwatering
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Temperature Hardy to -10°C; tolerates hot summer temperatures up to 30°C with adequate drainage
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Characteristics

  • Leaf: Silvery-gray woolly oblong to lanceolate leaves with slightly toothed margins
  • Flower: Clusters of bright yellow daisy-like composite flowers (1–2 cm diameter)
  • Stem: Erect, woolly stems branching near the top of the plant
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Care Guide

Watering

Keep soil evenly moist during active growth periods; avoid waterlogging

Fertilization

Apply a diluted balanced fertilizer once at the start of growth. Over-fertilization can reduce flower production and increase susceptibility to disease

Banana peel tea:Soak 2–3 chopped banana peels in 1 liter of water for 3 days; dilute 1:2 with water before applying to soil to avoid nutrient burn
Pruning
  • Deadhead spent flower heads regularly to extend the blooming season
  • Cut back stems to ground level after flowering to promote tidy, dense growth the following year
  • Remove any diseased or damaged foliage in early spring to reduce disease spread
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA-aligned: Contains pyrrolizidine alkaloids; ingestion may cause liver damage, vomiting, and diarrhea

Humans: Ingestion of large amounts causes mild gastrointestinal upset including nausea and abdominal pain

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental wildflower for pollinator gardens; avoid planting in areas accessible to livestock due to toxicity