| | | Family | Compositae | | Plant Type | herbaceous perennial | | Zone | USDA: 5a - 8b RHS: H EGF: H1 - H4 Australia: 1 - 2 | | Care Level | low, easy, suitable for beginners. | | Height | 1.5 - 2.4 m (5 - 8 ft) | | Spread | 0.9 - 1.8 m (3 - 6 ft) | | Light | full sun to partial shade | | Soil Moisture | average to moist, well-drained | | Soil Type | | | Soil pH | | | | Description | The herbaceous perennial Vernonia gigantea (giant ironweed) bears showy blossoms during late summer to early autumn. | | Cautions | Where conditions are favourable, Vernonia gigantea (giant ironweed) can be invasive and may require maintenance to keep it under control. | | |