Asteraceae
forest sunflower
Helianthus decapetalus
Synonyms
Helianthus arenicola
Helianthus leoninus
Helianthus saxicola
Helianthus trachelifolius
Other Common Names
roughleaf sunflower, ten-petal sunflower, thinleaf sunflower
Plant Type
Herbaceous Wildflower
Life Cycle
Perennial
Typical Size
3-6 ft. tall
3 ft. wide
Inolerant of
Poorly Drained Soil
Propagation
By division
Plant Planting Notes
Plant in an area where this rhizomatous plant can spread.
Plants/Diseases
No significant disease or pest issues.
Wildlife Benefits
Nectar/pollen source for pollinating insects, Host plant for butterfly larvae, Fruit/seeds for birds
Leaves
Leaves opposite on lower portion and alternate higher up on the stems, lanceolate to ovate with serrate margins. Rough textured.
Flowers
Flowers have 8-12 bright yellow ray flowers and and slightly more golden disc flowers.
Fruit
Achene.
Bark
Reddish purple stems.
Toxicity
No known toxicity.

USDA Hardiness Zones
4, 5, 6, 7, 8, 9
Light Exposure
Full Sun, Part Sun/Shade
Soil Moisture
Medium, Moist
Soil Drainage
Well-drained
Soil pH
Basic (greater than 8.0)
Native in South Carolina?
Yes
Plant Native Habitat
Woodlands, forests, and oak savannas with mesic soils.
Global Conservation Status (NatureServe)
Secure (G5)
Federal Conservation Status (USFWS)
Not Listed
Distribution Notes
Rare in the South Carolina coastal plain and sandhills. Uncommon in the piedmont and mountains.