100 Swamp Sunflower Seeds | Helianthus angustifolius Native Wildflower

Swamp Sunflower (Helianthus angustifolius) is a native North American wildflower prized for its late-season display of bright yellow, daisy-like blooms. This clump-forming perennial produces narrow, grass-like leaves and tall, sturdy stems that bring vertical interest to borders, meadows, and rain gardens. Its autumn flowers are a welcome source of color when many other perennials have finished blooming, and they attract pollinators such as bees and butterflies.

Ideal for naturalized plantings, pollinator gardens, and moist landscape areas, Swamp Sunflower tolerates wet soils better than many sunflowers. It combines well with ornamental grasses and other native perennials, adding a cheerful, wildflower look to the late-summer and fall garden.

Plant Features

• Bright yellow, daisy-like flowers with dark centers
• Narrow, lance-shaped green leaves on upright stems
• Blooms in late summer to fall
• Attracts bees, butterflies, and other pollinators
• Tolerates moist to wet soil conditions

Growing Information

• Botanical Name: Helianthus angustifolius
• Plant Type: Herbaceous perennial
• Sunlight: Full sun
• Soil: Moist to wet, well-drained soil
• Water Requirements: Moderate to high; keep soil consistently moist
• Growth Habit: Upright, clump-forming
• USDA Hardiness Zones: 5-9
• Bloom Season: Late summer to fall
• Mature Height: 3-6 feet
• Spacing: 18-24 inches apart

Planting & Care

Sow Swamp Sunflower seeds indoors 6-8 weeks before the last frost or directly outdoors after the danger of frost has passed. Press seeds lightly into the soil surface and keep them moist; light aids germination. Maintain consistent moisture until seedlings are established. Thin or transplant seedlings to the recommended spacing to allow good air circulation.

Once established, Swamp Sunflower is relatively low-maintenance. Water regularly, especially during dry spells, and provide support in windy areas if stems become tall. Deadhead spent flowers to encourage continued bloom, or leave seed heads for birds. Divide clumps every few years to maintain vigor.

What's Included

100 Swamp Sunflower seeds (Helianthus angustifolius).