Acorus americanus is a native wetland perennial known for its slender iris like foliage and subtle spadix flowers. Its aromatic leaves have a long history of use by Indigenous peoples and the plant thrives in saturated soils providing seasonal texture and habitat in rain gardens and along streambanks.
Height & Spread: 24 - 36 in x 18 - 24 in
Bloom Time: Late spring to early summer
Light Requirements: Full sun to part shade
Soil Preference: Moist to wet soils; thrives in saturated or standing water
Watering Needs: Requires consistently wet conditions; do not allow to dry out
Deer Resistance: Generally avoided by deer due to its aromatic leaves
Native Status
Acorus americanus is native to much of North America especially in wetland habitats such as bogs, marshes, and slow moving streams. It plays an important role in stabilizing soils and supporting native biodiversity in aquatic ecosystems.
WILDLIFE & INSECTS
Bees
- Visited by sweat bees and mining bees that forage on its early summer blooms along wetland margins.
Birds
- The thick clumps offer cover for wetland birds such as red winged blackbirds and rails; also provides insect foraging opportunities.
Beneficial Insects
- Hosts aquatic beetles and damselflies that thrive in marshy environments and contribute to natural pest control in wetland gardens.
Spacing & Landscape Use
Spacing Recommendations:
- Plant 18 - 24 in apart in colonies for soil stabilization or habitat restoration projects.
Landscape Placement:
- Ideal for wetland gardens, pond edges, rain gardens, and naturalized plantings where consistent moisture is available.
Companion Plants
- Osmunda cinnamomea (Cinnamon Fern) - Adds fine texture and deep green fronds that pair well with Acorus’ upright habit.
- Lobelia cardinalis (Cardinal Flower) - Vivid red flower spikes rise above wet soil margins and attract hummingbirds.
- Caltha palustris (Marsh Marigold) - Golden spring blooms brighten wet soils alongside the bold vertical blades of Acorus.
- Iris versicolor (Blue Flag Iris) - Offers striking blue purple flowers and shares similar moisture and light preferences.
- Carex stricta (Tussock Sedge) - Provides grassy structure and supports wetland pollinators and amphibians.