Dalmation iris, Sweet iris
Iris pallida

Hardiness: Zone 5 to 9
Plant type: Herbaceous perennial
Height: 2- 3'
Spread: 1.5- 2'
Sun: Full sun to part shade
Water: Medium
Bloom time: May, June
Bloom color: Pale lavender
Soil: Moist, humusy, well draining soils.

Notes: The highly fragrant flowers have a distinctive scent that is variously described as reminiscent of grape jelly, orange blossom, or vanilla

More information on this plant here.