Prickly Sow Thistle
Sonchus asper
Sonchus asper
About this plant
Sonchus asper, commonly known as Prickly Sow Thistle, is a fast-growing, spiny-leaved plant often found in disturbed areas like roadsides and fields. It has yellow dandelion-like flowers and can spread quickly. While considered a weed in many places, it has edible young leaves and is sometimes used in traditional medicine.
Taxonomy
- Genus
- Sonchus
- Family
- Asteraceae
- Higher classification
- Asterales
- Plant type
- Perennial
- Lifespan
- Perennial
Origin & Distribution
- Native region
- Europe, North Africa, Asia
- Distribution
- Widely distributed across Europe, North Africa, Asia, and introduced in many other regions worldwide including North America and Australia.
Care
- Light preference
- Full sun
- Suitable locations
- Outdoor, Balcony, Greenhouse
- Preferred window facing
- South-facing, West-facing
- Watering frequency
- Moderate
- Watering interval
- 3–10 days
- Humidity
- Normal
- Minimum
- -20 °C
- Maximum
- 35 °C
- Optimal
- 15–25 °C
- USDA hardiness zones
- 4–10
- Soil pH
- 6.0–7.5 (neutral to slightly acidic)
- Soil type
- well-draining loam, sandy or disturbed soils
Watering. Water moderately, allowing soil to dry out between watering. It tolerates drought once established but grows best with occasional watering.
Fertilizing. This plant generally does not require fertilizing and can grow well in poor soils. If desired, a balanced fertilizer can be applied in early spring to encourage growth.
Sonchus asper is a tough and fast-growing plant that can thrive in various soil types and conditions. It requires minimal care and can tolerate dry spells well. Overwatering or poor drainage may cause root problems, but generally, it is low maintenance.
Propagation
- Propagation methods
- Seeds, Cuttings
- Care difficulty
- Easy
Ornamental features
- Flowering
- Yes
- Flowering period
- spring–summer
Bright yellow flowers, spiny leaves, upright growth form
Toxicity & Safety
- Toxic to humans
- Non-toxic
- Toxic to pets
- Non-toxic
- Weed potential
- Potentially invasive
Non-toxic to humans and pets. Young leaves are edible when cooked but older leaves may be bitter.
Allergy information
- Allergy risk
- Low
- Allergy triggers
- Pollen
- Pollen level
- Moderate
Sonchus asper can produce pollen that may cause mild allergic reactions in sensitive individuals, especially during its flowering season. People with pollen allergies should avoid close contact or exposure during this time to reduce symptoms like sneezing or itchy eyes.
Common problems
If overwatered or grown in poorly drained soil, it may develop root rot. It can also become invasive if not controlled due to its fast growth and spreading habit.
Uses
Used as an edible wild green in some cultures; also valued for soil stabilization and as a naturalized plant in wild gardens.
Notes
Prune or remove plants regularly to prevent unwanted spreading. It can self-seed prolifically. Suitable for naturalized or wild garden areas rather than formal gardens.