Narrow Green Foliage
Produces slender, elongated green leaves that create a distinctive appearance in perennial garden plantings.
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Narrowleaf Sunflower (Helianthus angustifolius), commonly known as swamp sunflower, is a perennial flowering plant recognized for its slender, narrow green leaves and bright yellow, daisy-like flowers with dark centers. This attractive native wildflower can bring vibrant color to pollinator gardens, naturalized landscapes, and sunny garden borders. It is valued for its late-season blooms, which provide an attractive source of nectar for bees and butterflies. Narrowleaf Sunflower grows best in sunny locations with moist, well-drained soil and can adapt to a range of garden conditions.
Produces slender, elongated green leaves that create a distinctive appearance in perennial garden plantings.
Develops cheerful yellow, daisy-like flowers with dark centers that add seasonal color to outdoor spaces.
Its flowers provide nectar and pollen that attract bees, butterflies, and other beneficial pollinators.
Returns year after year in suitable growing conditions, making it a useful addition to perennial gardens.
| Scientific Name | Helianthus angustifolius |
| Common Name | Narrowleaf Sunflower; Swamp Sunflower |
| Plant Family | Asteraceae |
| Seed Type | Perennial Wildflower Seeds |
| Growth Habit | Upright, clump-forming perennial |
| Flower Color | Bright yellow petals with dark brown centers |
| USDA Hardiness Zones | 5–9 |
| Planting Season | Spring, after the danger of hard frost has passed |
| Seed Starting | Start indoors or sow directly outdoors in prepared soil |
| Germination Time | Approximately 7–14 days under suitable conditions |
| Germination Temperature | Approximately 70–75°F (21–24°C) |
| Sunlight | Full sun; tolerates partial shade |
| Soil Requirements | Moist, well-drained soil; tolerates wetter conditions |
| Watering | Regular watering, especially during establishment |
| Mature Plant Size | Approximately 5–8 feet tall, depending on growing conditions |
| Plant Spacing | Approximately 18–24 inches apart |
Add bright yellow flowers and graceful narrow foliage to your outdoor garden with Narrowleaf Sunflower. This perennial wildflower is an attractive choice for pollinator gardens, naturalized landscapes, and sunny planting areas. With suitable sunlight, consistent moisture, and proper care, it can provide beautiful seasonal blooms and support beneficial garden visitors.
Find helpful answers about Narrowleaf Sunflower seed germination, flowering season, and growing conditions.
Sow Narrowleaf Sunflower seeds in prepared soil approximately 1/4 inch deep. Choose a location with full sun and maintain consistent soil moisture during germination. Seeds can be started indoors or directly sown outdoors after the danger of hard frost has passed. Follow the seed supplier's instructions for the best results.
Narrowleaf Sunflower typically blooms from late summer into fall, producing clusters of bright yellow flowers. Flowering time depends on the local climate, planting conditions, and plant maturity. Its late-season blooms make it a valuable addition to gardens that support bees and butterflies.
Yes. Narrowleaf Sunflower, also called swamp sunflower, naturally grows in moist habitats and can tolerate wetter soil conditions than many other sunflower varieties. It is suitable for rain gardens, pond edges, and moisture-retentive landscape areas, provided the planting location offers appropriate sunlight.