Scientific Name: Sonchus oleraceus
Common Name: annual sow thistle
Family Name: Asteraceae
Origin: Europe
Hardiness Zone: Zone 4: (-34 to -29 °C)
Plant Type: Annual, Weed (horticultural)
Mature Size: 0.7 - 1.3m x 0.3 - 0.6m (height x width)
Habit: Upright
Form: Pyramidal - narrowly
Texture: Medium
Landscape Uses: Herb, Medicinal plant
Exposure: Full sun, Part sun/part shade
Soil or Media:
Leaves: Simple, Lobed, Alternate, Prickly, Glabrous, Lanceolate, Oblanceolate, Other, Pinnately lobed, Spinose
Flowers: Head (capitulum), Yellow, Apr-May-Jun-Jul
Fruit: Cypsela (achene + calyx), White, Brown, Jun-Jul-Aug-Sep
Key ID Features:
Habit tall, sturdy, dandelion-like with milky sap; leaves lobed with margin spiny; flower heads 1.5-2.5cm wide; short taproot (compared to perennial sow thistle head that are 3-5cm wide and form deep, rhizome-like roots.