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The Plant Guide

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Swamp sunflower

Helianthus angustifolius

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A profusion of golden yellow flowers appears for two to three weeks starting in early autumn. Daisy-like flowerheads are 3 inches across with 15 to 20 yellow ray florets radiating from a flat-topped purple or dark brown cone. The entire plant looks like a giant flame, drawing the attention of gardeners and many species of butterflies, bees, and other nectar feeders.

Noteworthy CharacteristicsThis tall U.S. native is great for a perennial border, meadow, or butterfly garden.

CareGrow in full sun and moist but well-drained, moderately fertile, humus-rich soil. Needs ample moisture. May require support.

PropagationDivide in spring or autumn. Root basal cuttings in spring. Or start from seed.

ProblemsCommon: downy mildew, powdery mildew, canker, rust, and many fungal leaf spots. Also susceptible to damage from caterpillars, cutworms, beetles, and weevils.

  • Genus : Helianthus
  • Plant Height : 3 to 6 feet
  • Plant Width : 3 to 6 feet
  • Zones : 6, 7, 8, 9
  • Bloom Time : Fall
  • Plant Seasonal Interest : Fall Interest
  • Light : Full Sun
  • Moisture : Medium Moisture
  • Growth Rate : Moderate
  • Maintenance : Moderate
  • Plant Type : Perennials
  • Flower Color : Yellow

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