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Helianthus angustifolius (Swamp Sunflower)

Helianthus angustifolius (Swamp Sunflower)

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Size

Next crop estimated: Mid May 2027

Estimated dates aren't guaranteed. Crops become ready throughout the month.

One of the showiest and most reliable late-season bloomers for wet, sunny sites, swamp sunflower is a genuine pollinator keystone species - supporting six named specialist bee species and serving as larval host for four different butterfly species.

Species Overview

Helianthus angustifolius is a tall, clump-forming perennial that grows 3 to 6 feet high. It is native to wetlands and moist habitats in the southeastern United States. From late summer to fall, it produces vibrant yellow flowers with dark centers, attracting pollinators and adding bright color to landscapes.

Application

  • Wetland restoration, rain gardens, and pond-edge plantings
  • Back-of-border plantings in naturalized or pollinator gardens
  • Larval host habitat for Silvery Checkerspot, Gorgone Checkerspot, Bordered Patch, and Painted Lady butterflies
  • Roadside ditch and low, wet-field naturalization

Growing Conditions / Specification Data

  • Light: Full Sun to Part Shade - flowers best in full sun
  • Soil/Moisture Tolerance: Moist to occasionally wet, acidic sandy to clay loams; adapted to low-fertility soils
  • Growth Rate: Moderate
  • Plant Type: Forb
  • Mature Height: 4-8 ft.
  • Fall Color: Insignificant/None
  • Bloom Color / Period: Yellow; August-October
  • Wetland Indicator Status: FACW (Facultative Wetland) - Atlantic and Gulf Coastal Plain region
  • Native Range: New York to Florida, west to Texas
  • Hydrology: Moist-Wet
  • Root Depth: Moderate (12-24 in.)
  • Salinity Tolerance: Low
  • Drought Tolerance: Low
  • Deer Resistance: Some
  • Flood Tolerance: High - Commonly called swamp sunflower for its association with wet ditches, marsh edges, and pond margins; tolerates periodically saturated to standing water.
  • Shade Tolerance: Intolerant
  • Growth Habit: Upright
  • USDA Hardiness Zones: 6-9
  • Pollinator Value: Larval host, supports bees, supports specialist/oligolectic bees, supports butterflies

Planting Guidance

  • Space plants 3 ft. on center; prune back in June to encourage a bushier habit and reduce the need for staking.
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