Twin Oaks Valley Greenhouses
$3.50–$14.50Distance unavailable · 2245 North Twin Oaks Valley Road, San Marcos, CA 92069
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trefle.io · Taken Oct 6, 2022 by Alex Arriaza (cc-by-sa)
Asteraceae
Swamp sunflower
Helianthus angustifolius
Also known as Leighia bicolor, Helianthus angustifolius, Rudbeckia angustifolia, Coreopsis angustifolia
Zones 4–9Sun Full SunWater ModerateCare Low
Flowering Plants · Native Plants · Native Perennial · Fall Blooming · Yellow Flowers · Rain Garden · Wet Soil · Sunflower · Pollinator · Wildlife Garden · Southeastern Native · Cut Flower
Beginner-friendlyAttracts pollinators
Toxicity: dogs, cats, horses — keep out of reach and wear gloves when pruning.
In stock at 1 nurseryStock updated 9/6/2026
Swamp sunflower is a vigorous native perennial that produces masses of bright yellow daisy-like flowers in fall, providing an important late-season nectar source for pollinators and seeds for birds. It thrives in moist to wet soils and full sun to part shade, making it excellent for rain gardens, pond edges, or low-lying spots in the landscape. Plants can spread over time to form attractive colonies, so give them room to naturalize.
Growing conditions
The details behind the basics
- Daily light
- 6 hours
- Watering
- Water deeply to keep soil consistently moist; tolerates brief wet periods · Every 7-10 days; more frequently in hot dry spells
- Maintenance
- Low
- Soil
- loam
- Soil pH
- 4–7
- Temperature
- -25°F to 95°F
- Cycle
- Perennial
- Propagation
- Seed
Hardiness
USDA 4b-9b
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Form & growth
Mature size and habit
- Mature height
- 10 ft – 30 ft
- Spread
- 15 ft
- Spacing
- 24 in apart
- Growth rate
- Moderate
- Root depth
- Medium
- Flowers
- Yellow
- Foliage
- Green · Medium
Ecology & origin
Where it belongs and what it brings
- Native to
- Alabama, Arkansas, Florida, Georgia, Indiana, Iowa, Jawa, Kentucky, Louisiana, Maryland, Mississippi, Missouri, New Jersey, New York, North Carolina, Ohio, Oklahoma, Pennsylvania, South Carolina, Tennessee
- Attracts
- Bees, Butterflies, Birds
Sources: trefle, usda, aspca
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