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Planting
Days to maturity
Seasonal yields
Sow indoors · Direct sow · Transplant outdoors
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Plant · P-1116
Swamp Sunflower
Helianthus angustifolius
Swamp Sunflower is a tall herbaceous perennial that produces masses of bright yellow, daisy-like flowers from late summer into fall, at a time when few other natives are still blooming. It spreads by rhizomes to form dense colonies in consistently moist to wet ground, tolerating heavy clay as well as sandy soil. The flowers draw a wide range of pollinators, and the seed heads that follow feed songbirds through winter.
Record at a glance
Growing profile
- Sun
- Full Sun · Partial Sun
- USDA zone
- USDA 5–9
- Soil
- Sand · Loam · Clay
- Moisture
- Moist · Wet
Vertical layer
Herbaceous- Soil pH
- 6–6
- Plant type
- Perennial
- Mature height
- 5–8 ft
- Mature spread
- 2.5–4 ft
- Plant spacing
- Not yet recorded
- Root type
- Rhizome
- Spread pattern
- Root
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The deeper layer
Plan what comes next.
- Primary
- Locked ecological function
- Secondary
- Locked ecological function
- Byproduct
- Locked ecological function
Behind the record
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