American Sweet Flag vs Round-Leaved Sundew - TreeTime.ca

American Sweet Flag vs Round-Leaved Sundew

Drosera rotundifolia

Acorus americanus

CUSTOM GROW

CUSTOM GROW

Round-Leaved Sundew
American Sweet Flag

Round-Leaved Sundew is a native carnivorous plant, easily recognized by its bright green leaves covered in distinctive red, glandular hairs. These hairs secrete a sticky substance that is used to attract, trap, and digest insects. Their carnivorous nature allows them to survive in nutrient-poor, acidic soils where many other plants may struggle to grow.
They produce small white flowers that grow along the top of a slender, leafless stem. They can be found growing in wetlands, most often among sphagnum moss, in consistently moist, acidic soils. It does best in cooler summer climates and is intolerant of shade. Due to its small size, the plant can be difficult to spot in its natural habitat. Round-Leaved Sundew is an indicator of healthy wetland systems and is valued in ecological restoration and conservation projects.

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.

Round-Leaved Sundew Quick Facts

American Sweet Flag Quick Facts

Zone: 3a
Zone: 3a
Height: 0.1 m (0.2 ft)
Height: 0.9 m (3 ft)
Spread: 0.1 m (0.4 ft)
Spread: 0.6 m (2.0 ft)
Light: partial shade, full sun
Light: partial shade, full sun
Moisture: wet
Moisture: wet
Growth rate: slow
Growth rate: fast
Life span: short
Life span: short
Growth form: rosette-forming
Growth form: upright, colony-forming
Spreading: axillary bud plantlets - medium, seeds - low
Spreading: rhizomes - high


Foliage: round, green with sticky red tentacles
Foliage: fragrant
Fall colour: red to marooon
Flowers: tiny white flowers on long leafless stem
Flowers: yellow floral spike
Bloom time: summer
Bloom time: spring to summer
Hybrid: no
Hybrid: no
Catkins: no
Catkins: no


Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, YT, NT, NU, PE
Native to: AB, BC, SK, MB, ON, QC, NS, NB, NL, NT, PE
Other Names: roundleaf sundew
Other Names: american sweetflag