Photo by Melody

PlantFiles: Smooth Sow Thistle
Sonchus oleraceus 'Stephen Mifsud'

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Sonchus (SON-chus) (Info)
Species: oleraceus (awl-lur-RAY-see-us) (Info)
Cultivar: Stephen Mifsud


12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)

Unknown - Tell us

Not Applicable

Sun Exposure:
Full Sun
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Bright Yellow

Bloom Time:
Late Winter/Early Spring
Mid Spring
Mid Winter


Other details:
May be a noxious weed or invasive
Requires consistently moist soil; do not let dry out between waterings

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall

Seed Collecting:
Unknown - Tell us


No positives
No neutrals
1 negative

Gardeners' Notes:

Negative Malus2006 On Feb 19, 2008, Malus2006 from Coon Rapids, MN (Zone 4a) wrote:

Hard to believe there is a variety of this very common weed - sow - thistles is often classified as "yellow daisy and dismissed by a lot of people. It is very common, growing in roadsides and ditches, and many other locations, often in tall grasses near large lots but will grow in poor soil. It look like a tall dandelion when blooming but to tell the different between it and the group - false dandelion - it have more leaves that grows up the flowering stalks - leaves that is lobed. When using a weedwhip or snapping the stems, it gives off large amount of water along with a milky juice. It is non - pricky compare with the other species, S. asper.


This plant has been said to grow in the following regions:

Minneapolis, Minnesota
Lincoln, Nebraska

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