Rhombic-leaved Sunflower
Rhombic-leaved Sunflower
Helianthus subrhomboideus
Aster family - Asteraceae/Compositae

Sunny yellow flowers are 6cm (2.5”) The seeds are very attractive to birds, especially Goldfinches. Thrives in cultivation and spreads aggressively by rhizomes. Plant in a buried plastic pot or surround with buried 6” lawn edging.

Bloom time: Aug., Sept.
Ht: 30-120 cm (12-48”)
Sun; average soil.