Helianthus Angustifolius Seeds - Flower Plant

Helianthus angustifolius, commonly known as Swamp Sunflower, is a hardy native perennial prized for its masses of bright golden-yellow flowers and narrow green foliage. It is well suited to pollinator gardens, wildflower meadows, rain gardens, borders, and naturalized landscapes. The plant thrives in full sun with moist to well-drained soil and blooms profusely from late summer into fall. Its nectar-rich flowers attract butterflies, bees, and other beneficial pollinators while providing vibrant late-season color.

Features

• Native perennial wildflower
• Produces abundant bright golden-yellow blooms
• Excellent for pollinator and wildlife gardens
• Ideal for rain gardens, meadows, and borders
• Long-lasting late summer and fall flowering
• Adaptable to moist soils and seasonal wet conditions
• Easy to grow and low maintenance once established

Specifications

• Scientific Name: Helianthus angustifolius
• Common Name (US): Swamp Sunflower
• Seed Type / Variety: Native Wildflower Variety
• Growth Habit: Upright perennial
• USDA Zones: 5–9
• Planting Season: Spring or Fall
• Growing Season: Spring through Fall
• Sowing Season: February–April or September–November
• Germination Time and Conditions: 14–30 days at 65–75°F (18–24°C); cold stratification for 30–60 days may improve germination
• Sunlight Requirements: Full sun
• Soil Requirements: Moist, well-drained loamy, clay, or sandy soil
• Watering Needs: Moderate to high; prefers consistently moist soil but tolerates short dry periods once established
• Mature Plant Size: 5–8 feet tall, 2–4 feet spread
• Plant Spacing: 24–36 inches apart