Acute Willow vs American Sweet Flag - TreeTime.ca

Acute Willow vs American Sweet Flag

Acorus americanus

Salix acutifolia

CUSTOM GROW

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American Sweet Flag
Acute Willow

American Sweet Flag is a native perennial wetland plant found along shorelines, streams, wet meadows, and marshes. Its extensive rhizome system allows it to spread and stabilise soil, helping maintain the edges of ponds and streams. This dense growth provides cover for small animals and supports overall wetland biodiversity, while the rhizomes and seeds serve as food for small mammals and waterfowl. Cold-hardy and resilient, it is well-suited for ecological restoration, riparian plantings, erosion control, and naturalization projects.

The plant grows in dense clumps with tall, sword-shaped leaves that release a citrus-like scent when bruised. The rhizomes are aromatic, with a spicy, cinnamon-like fragrance that has been used in perfumery and flavouring. In early summer, American Sweet Flag produces a distinctive floral spike (spadix), adding visual interest to wetland plantings.

Acute Willow is a very fast growing small tree that can reach growth rates of up to 6 feet per year. It's a great choice for developing a quick, hardy shelterbelt, windbreak, or privacy screen.

Acute Willow will grow multi-stemmed but can be pruned to a single stem for a smaller footprint. It prefers moist areas and requires almost no maintenance.

Willows are important to native pollinators each spring as they have higher amounts of pollen and nectar early each growing season when other food sources are scarce.

American Sweet Flag Quick Facts

Acute Willow Quick Facts

Zone: 3a
Zone: 2a
Height: 0.9 m (3 ft)
Height: 12 m (40 ft)
Spread: 0.6 m (2.0 ft)
Spread: 11 m (35 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: wet
Moisture: normal, wet
Growth rate: fast
Growth rate: fast
Life span: short
Life span: short
Growth form: upright, colony-forming
Spreading: rhizomes - high
Suckering: low


Foliage: fragrant
Foliage: long slender leaves
Bark: younger branches are bright brown-red
Flowers: yellow floral spike
Bloom time: spring to summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: yes


In row spacing: 2.4 m (8 ft)
Between row spacing: 5 m (16 ft)
Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, NT, PE
Other Names: american sweetflag
Other Names: acute leaf willow, acute leafed willow, long-leaved violet willow, sharp-leaf willow