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Extension

Helianthus angustifolius

Narrow-leaf or Swamp sunflower is a native perennial that can grow up to 8 feet with leaves that are rough and narrow, producing showy late-season yellow flowers. They often put on a spectacular display as late as Halloween and into early November. Prune plants back in June to encourage branching. Shorter cultivars are available such as ‘First Light’ and ‘Low Down’.
Narrow-leaf sunflower prefer moist to occasionally wet acidic sandy to clay soil loams in full sun but can be grown on drier soils if adequate moisture is provided. Staking may be required to support plants in windy areas.
Narrow-leaf sunflower is highly attractive to songbirds and pollinators. The plant is also a larval host for the Silvery Checkerspot (Chlosyne nycteis). Songbirds, quail, mourning doves, and small mammals are attracted to the seeds through the winter. Narrow-leaf sunflower is a great choice for perennial borders, native plantings, butterfly or pollinator gardens, along streams or ponds, and rain gardens.
Exposure: sun
Soil: moist to occasionally wet; tolerates drier soil but needs supplemental irrigation
Hardiness: USDA Zones 5-9
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