Hibiscus trionum, flower of an hour

flower of an hour
Hibiscus trionum

Hardiness: Zones 2 to 11
Plant type: Annual
Height: 1.5- 2'
Spread: 1.5- 2'
Sun: Full sun
Water: Medium
Bloom time: June to frost
Bloom color:  Cream to pale yellow with dark centers
Soil: Average to rich, well-draining soil, tolerates poor soil                  Notes: Robust self-seeder

More information on this plant here.