Quick Facts

• Mature size: Approx. 1200–1500mm high x 800–1000mm wide

• Position: Full sun

• Foliage: Narrow, dark green leaves

• Flowering: Late summer to autumn

• Flower colour: Bright yellow, daisy-like blooms with golden centres

• Climate tolerance: Heat, frost, and drought tolerant

• Water needs: Moderate; tolerates wetter soils

• Maintenance: Low

Why You’ll Love it

Helianthus angustifolius, commonly known as Swamp Sunflower, is a tall and striking perennial prized for its vibrant yellow daisy-like flowers that light up the garden from late summer into autumn. Its upright, bushy habit creates height and structure, making it perfect for the back of borders, naturalistic plantings, or wet and damp areas where other perennials may struggle. The bright flowers attract bees and butterflies, while its tough, hardy nature ensures long-lasting performance with minimal maintenance.

Planting & Care Tips

• Plant in full sun for best flowering and growth

• Prefers well-drained to moderately moist soil; tolerates damp conditions

• Water during establishment, then moderately once established

• Deadhead spent flowers to encourage continued blooming

• Cut back in late winter or early spring to promote fresh growth

• Ideal for naturalistic borders, wet gardens, and pollinator-friendly plantings