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Sweet Flag

Acorus calamus

Please keep in mind that it is illegal to uproot a plant without the landowner's consent and care should be taken at all times not to damage wild plants. Wild plants should never be picked for pleasure and some plants are protected by law.
For more information please download the BSBI Code of Conduct PDF document.

Contents

Plant Profile

Flowering Months:
JAN  FEB  MAR  APR  MAY  JUN  JUL  AUG  SEP  OCT  NOV  DEC
Order:
Acorales
Family:
Acoraceae (Sweet Flag)
Also in this family:
Type:
Flower
Life Cycle:
Perennial
Maximum Size:
180 centimetres tall
Habitats:
Bogs, ditches, marshes, ponds, riverbanks, riversides, water, waterside, wetland.

Flower:
֍
Green, 1 petal
 
A greenish-yellow spadix, up to 9cm long. 6 stamens. Insect pollinated.
Fruit:
A dry berry. Fruits are rarely (or never) produced in the British Isles. The seeds ripen in July and August.
Leaves:
The leaves are long, flat and sword-like with entire margins. Similar in appearance to Yellow Flag Iris (Iris pseudacorus) but with a thicker midrib and wrinkly-edged leaves on one side. Perennial.
Aroma:
Sweet smelling.
Other Names:
Beewort, Bitter Pepper Root, Calamus, Calamus Root, Flagroot, Gladdon, Myrtle Flag, Rat Root.
Frequency (UK):
Occasionally seen  

Similar Species

Other Information

Summary

Acorus calamus, also known as sweet flag or calamus, is a perennial wetland plant in the family Acoraceae. It is native to much of Europe, Asia, and North America. It is a semi-aquatic plant, commonly found in wetlands, bogs, marshes, and along the banks of streams and rivers.

Acorus calamus is a herbaceous perennial that can grow to about 3-4 feet tall. It has long, narrow, green leaves that are about 2-4 feet long, and are arranged in a fan-like fashion. The plant has a characteristic sweet aroma, which is particularly strong when the leaves are crushed. The flowers are small, greenish-white and are arranged in a dense spike. They appear in late spring or early summer.

Acorus calamus has a long history of use in traditional medicine and is considered to have several medicinal properties. The rhizomes (underground stem) of the plant have been used to treat a wide range of conditions, including digestive disorders, headaches, and respiratory infections. The plant is also believed to have anti-inflammatory and antimicrobial properties.

However, it is important to note that while the plant has been used in traditional medicine for centuries, its efficacy and safety have not been extensively studied or confirmed by modern scientific research. Additionally, the plant contains small amounts of an oil called asarone, which in large doses can cause adverse effects such as hallucinations, seizures, and liver damage. Therefore, it is important to use the plant only under the guidance of a qualified healthcare practitioner.

Cultivation of the plant is not recommended for it is now considered as a potentially invasive species in some regions, and can crowd out native vegetation.


Blog

Sweet flag, also known as Acorus calamus, is a herbaceous plant that is native to Asia and Europe. It is a perennial plant that belongs to the Acoraceae family, which also includes two other species of Acorus. Sweet flag has a long history of use in traditional medicine and has been used for a wide range of ailments.

Description and Habitat

Sweet flag is a tall plant that can grow up to 6 feet (1.8 meters) in height. It has long, narrow leaves that are glossy and sword-shaped, with a pointed tip. The leaves are about 1 inch (2.5 cm) wide and can grow up to 3 feet (0.9 meters) long. The flowers of sweet flag are small and inconspicuous, and the plant produces small, berry-like fruit.

Sweet flag grows in wet, marshy areas and is often found near the edges of streams, ponds, and lakes. It prefers moist soil and partial shade and can be found in many parts of Asia and Europe.

Traditional Uses

Sweet flag has a long history of use in traditional medicine. In Ayurvedic medicine, sweet flag is known as vacha and is used to improve memory, as well as to treat digestive disorders, respiratory ailments, and skin conditions. In Chinese medicine, sweet flag is known as shi chang pu and is used to improve digestion, reduce inflammation, and improve mental clarity.

Sweet flag has also been used in traditional medicine in other parts of the world. In North America, it was used by Native American tribes to treat a variety of ailments, including fever, headaches, and digestive problems. It was also used as a remedy for snake bites and insect stings.

Modern Uses

Today, sweet flag is used in a variety of ways. Its essential oil is used in aromatherapy to promote relaxation and improve mental clarity. It is also used in perfumes, soaps, and other cosmetic products.

Sweet flag is also used in some cultures as a flavoring agent. In Europe, it is sometimes added to alcoholic beverages to improve their taste. In India, it is used to flavor sweets and other foods.

In addition, sweet flag has been studied for its potential medicinal properties. Some studies suggest that it may have anti-inflammatory and anti-microbial properties, as well as the ability to improve cognitive function. However, more research is needed to fully understand its potential benefits.

Precautions and Side Effects

While sweet flag has many potential benefits, it should be used with caution. The plant contains a compound called beta-asarone, which has been shown to be carcinogenic in animal studies. As a result, the use of sweet flag is restricted in some countries.

In addition, sweet flag can cause side effects such as nausea, vomiting, and diarrhea if taken in large doses. It can also cause drowsiness and should not be taken before driving or operating heavy machinery. Pregnant and breastfeeding women should avoid using sweet flag, as its safety in these populations has not been established.

Sweet flag is a versatile plant with a long history of use in traditional medicine. While more research is needed to fully understand its potential benefits, it has shown promise in improving cognitive function, reducing inflammation, and improving digestion. However, it should be used with caution, as it can cause side effects and its safety has not been established in certain populations. As with any herbal supplement, it is important to speak with a healthcare provider before using sweet flag.

Propagation and Cultivation

Sweet flag can be propagated through seeds or by dividing the rhizomes. It is a hardy plant that can grow in a variety of soil types, but prefers moist, fertile soil. It should be planted in a partially shaded area with protection from strong winds. The plant should be kept well-watered and can be fertilized with a balanced fertilizer during the growing season.

Harvesting and Storage

The rhizomes of sweet flag are the part of the plant that is used for medicinal purposes. They can be harvested in the fall, after the plant has gone dormant. The rhizomes can be dried and stored in an airtight container for later use.

Culinary Uses

Sweet flag has a unique flavor that is described as sweet, bitter, and pungent. It is used as a flavoring agent in some cultures and can be added to baked goods, candies, and liqueurs. It is also used to flavor herbal teas and can be added to soups and stews for a subtle, aromatic flavor.

Legal Status

The use of sweet flag is regulated in some countries due to its potential carcinogenic properties. In the United States, the Food and Drug Administration has classified sweet flag as an unsafe herb and it is not approved for use in food or supplements. In Europe, the use of sweet flag is restricted and it is only approved for use in certain cosmetic products.

Sweet flag is a plant with a long history of use in traditional medicine and culinary practices. While it has potential medicinal benefits, it should be used with caution due to its potential side effects and carcinogenic properties. As with any herbal supplement, it is important to speak with a healthcare provider before using sweet flag.

Ecological Importance

Sweet flag is an important plant in wetland ecosystems, as it helps stabilize soils and prevent erosion. It also provides habitat for a variety of wildlife, including birds, insects, and amphibians. The rhizomes of sweet flag can be used to filter pollutants from water, making it a valuable plant for water quality improvement.

Cultural Significance

Sweet flag has played an important role in many cultures throughout history. In Hindu mythology, sweet flag is associated with the goddess Saraswati, who is the goddess of learning, music, and poetry. It is believed that using sweet flag can help improve cognitive function and enhance creativity. In some Native American cultures, sweet flag is considered a sacred plant and is used in spiritual ceremonies.

Alternative Names

Sweet flag is also known by many other names, including calamus root, beewort, bitter pepper root, flagroot, gladdon, myrtle flag, and rat root.

In Conclusion

Sweet flag is a versatile plant that has been used for centuries for a variety of purposes. While more research is needed to fully understand its potential benefits, it has shown promise in improving cognitive function, reducing inflammation, and improving digestion. However, it should be used with caution, as it can cause side effects and its safety has not been established in certain populations. As with any herbal supplement, it is important to speak with a healthcare provider before using sweet flag.


Distribution Map

Reproduced by kind permission of the BSBI.

Click to open an Interactive Map