100 Swamp Sunflower Seeds – Heirloom Non-GMO Wildflower for Native Garden Planting

Swamp Sunflower (Helianthus angustifolius) is a native perennial wildflower prized for its late-season display of bright yellow daisy-like blooms. Reaching heights of 4 to 6 feet, this clump-forming plant adds dramatic vertical interest to borders, meadows, and rain gardens. Its tolerance for wet soils and ability to attract pollinators make it a valuable addition to native plant landscapes.

This heirloom, non-GMO variety is grown for its reliable performance and ecological benefits. The abundant late summer to fall flowers provide a vital nectar source for bees and butterflies when many other plants have finished blooming. Swamp Sunflower thrives in full sun and adapts to a range of soil conditions, from moist to occasionally dry once established.

Plant Features

• Bright yellow, daisy-like flowers with dark centers
• Blooms late summer through fall
• Attracts pollinators such as bees and butterflies
• Perennial in USDA zones 5-9
• Tolerates wet soils and clay

Growing Information

• Botanical Name: Helianthus angustifolius
• Plant Type: Herbaceous perennial
• Sunlight: Full sun
• Soil: Moist to average, well-drained; tolerates clay
• 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: 4-6 feet
• Spacing: 18-24 inches

Planting & Care

Sow seeds indoors 6-8 weeks before the last frost or directly outdoors in spring after danger of frost has passed. Press seeds lightly into the soil surface; they need light to germinate. Keep the growing medium consistently moist but not waterlogged. Germination typically occurs in 10-21 days at temperatures around 65-70°F (18-21°C). Once seedlings have several true leaves, transplant them outdoors after hardening off, spacing them 18-24 inches apart in a sunny location.

Swamp Sunflower is relatively low-maintenance once established. Water regularly during dry spells, especially in the first growing season. Tall stems may benefit from staking in windy areas. Divide clumps every few years to maintain vigor. Deadhead spent flowers to encourage additional blooms or leave seed heads for birds.

What's Included

100 Swamp Sunflower seeds.