Swamp Sunflower (Helianthus angustifolius): Tall Native for Fall Butterflies

Swamp sunflower (Helianthus angustifolius) produces a profusion of golden yellow flowers for 2–3 weeks starting early autumn. Daisy-like 3-inch heads with 15–20 yellow rays radiating from flat purple/dark brown cone. Entire plant looks like a giant flame.Noteworthy Features

Tall U.S. native for perennial border, meadow, butterfly garden.

Culture & Propagation

Full sun, moist but well-drained, moderately fertile, humus-rich soil. Needs ample moisture. May require support. Divide spring/autumn. Root basal cuttings spring. Or start from seed.

Problems

Downy/powdery mildew, canker, rust, fungal leaf spots. Caterpillars, cutworms, beetles, weevils.

Quick Reference

• Height/Spread: 3–6 ft.
• Growth Habit: Clumps
• Growth Pace: Moderate
• Light: Full sun only
• Moisture: Medium
• Maintenance: Moderate
• Bloom Time: Fall
• Flower Color: Yellow
• Attributes: Native, attracts bees, butterflies, songbirds
• Uses: Beds, borders, cut flowers, meadow gardens