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PlantFiles: Arrowleaf Ragwort, Arrowleaf Groundsel
Senecio triangularis

Family: Asteraceae (ass-ter-AY-see-ee) (Info)
Genus: Senecio (sen-ek-ee-o ) (Info)
Species: triangularis (try-an-gew-LAIR-iss) (Info)

Alpines and Rock Gardens
Ponds and Aquatics

12-18 in. (30-45 cm)
18-24 in. (45-60 cm)
24-36 in. (60-90 cm)
36-48 in. (90-120 cm)
4-6 ft. (1.2-1.8 m)

9-12 in. (22-30 cm)
12-15 in. (30-38 cm)

Unknown - Tell us

Sun Exposure:
Full Sun
Sun to Partial Shade

Unknown - Tell us

Bloom Color:
Gold (Yellow-Orange)

Bloom Time:
Mid Summer
Late Summer/Early Fall


Other details:
Very high moisture needs; suitable for bogs and water gardens
Self-sows freely; deadhead if you do not want volunteer seedlings next season

Soil pH requirements:
Unknown - Tell us

Patent Information:
Unknown - Tell us

Propagation Methods:
From seed; direct sow outdoors in fall

Seed Collecting:
Bag seedheads to capture ripening seed
Allow seedheads to dry on plants; remove and collect seeds

Click thumbnail
to view:

By Toxicodendron
Thumbnail #1 of Senecio triangularis by Toxicodendron

By Toxicodendron
Thumbnail #2 of Senecio triangularis by Toxicodendron

By kennedyh
Thumbnail #3 of Senecio triangularis by kennedyh

By GardenGuyKin
Thumbnail #4 of Senecio triangularis by GardenGuyKin

By altagardener
Thumbnail #5 of Senecio triangularis by altagardener


1 positive
1 neutral
No negatives

Gardeners' Notes:

Neutral melody On Feb 14, 2005, melody from Benton, KY (Zone 7a) wrote:

Triangular or arrowhead-shaped leaves with many teeth or jagged edges on several leafy stems topped by yellow flower heads in a branched flattish cluster.

As indicated by the common and species names, the triangular leaves are distinctive.

Positive Toxicodendron On Aug 22, 2003, Toxicodendron from Piedmont, MO (Zone 6a) wrote:

These cheerful blooms carpet the high mountain stream edges from Alaska to New Mexico and Southern California. They can be somewhat invasive under prime conditions of full sun and consistent moisture. I have not attempted to grow these, since they require cooler summer temps than I have at home.

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