sweet flag
Acorus calamus

Hardiness: Zones 4-10
Plant type: Rush or Sedge
Height: 2- 2.5'
Spread: 1.5- 2'
Sun: Full sun to part shade
Water: Medium to wet, tolerates standing water
Bloom: Non-showy
Soil: Thrives in wet boggy soils

Notes: Plants thrive in wet, boggy soils and are commonly grown today as foliage accents in water gardens and pond margins. Leaves and roots give off a sweet scent when bruised, hence its common name.

More information on this plant here.