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Growing Info

Scarification: Soak in water, let stand in water for 24 hours

Stratification: cold stratify for 30 days

Germination: sow seed 1/2" deep, tamp the soil, keep moist but not wet

Helianthus angustifoliusHelianthus angustifolius

Narrowleaf Sunflower, Swamp Sunflower

In Stock: 0.995 lb (Total:0.995lb)

Helianthus angustifolius

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0.99 lb NC

Details

Germination:

89%

Germination test:

Actual

Purity:

99%

Seeds per lb:

374,220

Quantity:

0.99 lb

Collected in:

North Carolina

Crop year:

2024

Min. hardiness zone:

Item ID:

1835897

Characteristics

Growing Info

Scarification: Soak in water, let stand in water for 24 hours

Stratification: cold stratify for 30 days

Germination: sow seed 1/2" deep, tamp the soil, keep moist but not wet

Discover the beauty of Helianthus angustifolius, also known as Swamp Sunflower or Narrow Leaf Sunflower. This upright clumping perennial flourishes with bright, glossy green leaves. In autumn, it unfurls clouds of golden daisy-shaped flowers, acting as a magnet for migrating butterflies. As a late-blooming sunflower, it extends the season of yellow flowers until the first frost. It grows stately and tall, reaching up to 10 feet high in sunny or partly sunny, moist sites. Found across the eastern United States from New York to Florida and west to Missouri, Oklahoma, and Texas, it thrives in a variety of habitats such as floodplains, swamps, bogs, wet meadows, roadsides, and even coastal salt marshes. It's also a favorite among birds, with golden brown seed clusters providing winter sustenance. Swamp Sunflower stands out with its dark globe-shaped clusters and 10-20 golden yellow ray florets. Besides their aesthetic appeal, these plants are hardy enough for USDA Zones 5-9 and require minimal maintenance, merely needing a sunny site with acidic, moist or wet soil to thrive. Swamp Sunflower, flowering from September or October until frost, is sure to enhance your garden, providing a striking color contrast against a clear blue October sky.