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PlantFiles: Oxford Ragwort
Senecio squalidus

 
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Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Senecio (sen-NEESH-shee-oh) (Info)
Species: squalidus (SKWA-lee-dus) (Info)

Category:
Biennials

Height:
18-24 in. (45-60 cm)

Spacing:
Unknown - Tell us

Hardiness:
USDA Zone 9b: to -3.8 °C (25 °F)
USDA Zone 10a: to -1.1 °C (30 °F)
USDA Zone 10b: to 1.7 °C (35 °F)
USDA Zone 11: above 4.5 °C (40 °F)

Sun Exposure:
Full Sun
Sun to Partial Shade

Danger:
All parts of plant are poisonous if ingested

Bloom Color:
Bright Yellow

Bloom Time:
Mid Summer
Late Summer/Early Fall
Mid Fall

Foliage:
Unknown - Tell us

Other details:
May be a noxious weed or invasive

Soil pH requirements:
6.1 to 6.5 (mildly acidic)
6.6 to 7.5 (neutral)
7.6 to 7.8 (mildly alkaline)
7.9 to 8.5 (alkaline)

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall

Seed Collecting:
Unknown - Tell us

Click thumbnail
to view:

By kennedyh
Thumbnail #1 of Senecio squalidus by kennedyh

Profile:

No positives
No neutrals
1 negative

Gardeners' Notes:

RatingAuthorComment
Negative DerekSmith On Dec 30, 2002, DerekSmith wrote:

The plant is invasive and poisonous, rated in many countries as a injurious weed designated for control.

The plant contains at least two Pyrrolizidine Alkaloids, toxic by ingestion or skin absorption. The toxins cause terminal liver failure, cirrhosis or cancer in most animals including man.

Handle with great care wearing protective gloves



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