Details of...
Scientific Name: Sonchus oleraceus
Pronunciation: SON-chus awl-lur-RAY-see-us
Common Name: annual sow thistle
Family Name: Asteraceae
Plant Type: Weed (horticultural), Annual
Key ID Features: Habit tall, sturdy, dandelion-like with milky sap; leaves lobed with margin spiny; flower heads 1.5 - 2.5 cm wide; short taproot (compared to perennial sow thistle head that are 3-5 cm wide and form deep, rhizome-like roots).
Course(s): not used (on campus)

Habit: Upright
Form: Pyramidal - narrowly
Texture: Medium
Mature Size:
Height:0.7 - 1.3m
Spread:0.3 - 0.6m
Growth Rate:Fast
Origin: Europe
Hardiness Rating: Zone 4: (-34 to -29 C)
Exposure: Full sun, Part sun/part shade
Soil/ Growing Medium:
Landscape Uses: Herb, Medicinal plant
Additional Info: Google. Compare to perennial sow thistle.
annual sow thistle
Leaf Morphology: Glossary
Form: Lobed, Simple
Arrangement: Alternate
Texture/ Venation: Prickly
Surfaces: Glabrous
Colour in Fall: Yellow
Leaf(let) Terms:
Shapes: Lanceolate, Oblanceolate, Other
Apices: Acute
Bases: Auriculate, Sheathing
Margins: Pinnately lobed, Spinose

Inflorescence Type: Head (capitulum)
Flower Morphology:
Corolla Shape:Ligulate
Colour (petals): Showy, Yellow
Flower Time at Peak: Apr, May, Jun, Jul
Additional Info: only ray florets present

Fruit Type: Cypsela (achene + calyx)
Fruit Colour: White, Brown
Fruiting Time: Jun, Jul, Aug, Sep

Bark or Stem Colour: Green

(WDY) WeeDY location
Location Map

Report an Error