American Sweet Flag vs Wood Lily - TreeTime.ca

American Sweet Flag vs Wood Lily

Acorus americanus

Lilium philadelphicum

CUSTOM GROW

CUSTOM GROW

American Sweet Flag
Wood Lily

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.

Wood Lily is a native perennial wildflower known for its vibrant, trumpet-shaped blooms in shades of orange to red. Its showy flowers appear mid-summer and are highly visible in meadows and prairies. The upward-facing flowers are an important nectar source for many pollinators, including native bees, butterflies, and hummingbirds.
Unlike most lilies, the Wood Lily’s flowers face upward rather than nodding. It is slow to establish and may take years before flowering, but once mature, it requires little maintenance. It is well-suited for pollinator gardens, naturalisation projects, prairie restoration, and open woodland plantings.
Wood Lily is the provincial flower of Saskatchewan and North America’s most widespread lily. Despite its wide natural range, populations have been declining. Habitat loss, overgrazing by deer, and unsustainable picking have reduced both its abundance and density across many regions. These pressures highlight the importance of protecting and restoring this once-common wildflower.

American Sweet Flag Quick Facts

Wood Lily Quick Facts

Zone: 3a
Zone: 2b
Height: 0.9 m (3 ft)
Height: 0.6 m (2.0 ft)
Spread: 0.6 m (2.0 ft)
Spread: 0.3 m (1.0 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: wet
Moisture: normal, wet
Growth rate: fast
Growth rate: medium
Life span: short
Life span: short
Growth form: upright, colony-forming
Growth form: upright
Spreading: rhizomes - high
Spreading: seeds - low


Toxicity: toxic to cats
Foliage: fragrant
Flowers: yellow floral spike
Flowers: bright orange to red with dark spots
Bloom time: spring to summer
Bloom time: early to mid summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, NT, PE
Native to: AB, BC, SK, MB, ON, QC
Other Names: american sweetflag
Other Names: prairie wood lily, red lily, red wood lily