Canary Island Sow Thistle (Sonchus canariensis)

Canary Island Sow Thistle

Sonchus canariensis

Its silvery foliage glows softly in sun, a tough evergreen perennial. Common name: Canary Island Sow Thistle.

Full sun
1–2/week
Beginner
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Plant Needs

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Sunlight Full sun to partial shade; tolerates coastal wind and dry, arid conditions
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Watering Water deeply when top 2–3 cm of soil is dry; drought-tolerant once established
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Temperature Thrives in 15–25°C; tolerates light frost down to 5°C
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Characteristics

  • Leaf: Silvery-green, lanceolate to oblong, with slightly toothed margins, covered in fine white hairs
  • Flower: Bright yellow composite daisy-like blooms, 3–5 cm in diameter, borne on branching stems
  • Stem: Erect, fleshy, covered in soft white pubescence
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Care Guide

Watering

Keep soil evenly moist during active growth periods

Fertilization

Diluted balanced liquid feed once monthly. Skip fertilization in winter when growth slows

Eggshell powder top-dress:Crush dried eggshells into fine powder; sprinkle 1–2 tbsp around base of plant every 3 months
Pruning
  • Deadhead spent blooms to encourage prolonged flowering and prevent self-seeding
  • Trim back leggy stems in early spring to promote compact, bushy growth
  • Remove damaged or yellowing foliage to maintain plant health and airflow
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Toxicity

Warning: this plant may be toxic.

Pets & Humans

Pets: ASPCA confirms no toxic effects for cats

Humans: No known toxic effects for humans; young leaves are occasionally consumed as edible greens

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Garden Uses & Culture

Culture: N/A

Usage: Ornamental foliage plant for xeric gardens; young leaves are edible in small quantities