Halberd-leaved rose mallow
Hibiscus laevis

Hardiness: Zones 4 to 9
Plant type: Herbaceous perennial
Height: 4- 6'                                                                                                                                     Spread: 3- 4'
Sun: Full sun to part shade
Water: Medium to wet
Bloom time: May to November
Bloom color: Pink, white
Soil: Sandy, sandy loam, clay Loam, clay, acidic.

More information on this plant here.