Acorus calamus
Acorus calamus
Acorus calamus
Acorus calamus
Acorus calamus
Acorus calamus
Acorus calamus
Sweet Flag, Calamus
Maybe it's better to choose another delivery service than Chronopost: The plants haven't arrived at the pickup point yet. They will be very damaged after four days!!! The second attempt at delivery was successful. A BIG THANK YOU FOR THE RESEND!!!
Oswald, 23/03/2024
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Description
Acorus calamus, also known as Sweet Flag, Reed or Sweet Sedge, is a semi-aquatic perennial plant with a grass-like appearance, distinguished by its elegant, graphic foliage, semi-evergreen, aromatic when crushed. Its long, narrow, bright green ribbon-like leaves emit a mandarin scent. This species, naturalized in the northern hemisphere, is widely used in herbal medicine. Hardy, it can be planted in heavy, moist soil or in shallow water, where it may eventually produce insignificant flowers. Acorus brings brightness and structure to the edges of water features or in wet areas, in full sun or partial shade.
Acorus calamus belongs to the Araceae family. Native to Asia, it can be found in Northern and Central Europe, as well as North America. In eastern France, it has adapted to the edges of ponds and ditches. The Sweet Flag grows from a trailing, ramified, vigorous rhizome, which thrives in permanently moist soil, even in shallow water. With an upright habit, the plant reaches a height of 80cm (32in), or even 1m and more. Its leaves are sheathing, basal, ribbon-like, narrow, bright green, with plicate margins. They form large clumps. The young spring shoots have a reddish colouration. They are fragrant when crushed. Its insignificant flowers appear in summer if the plant is submerged, in a cylindrical yellowish spike of about 7cm (3in) long. Acorus calamus is the hardiest of the Sweet Flags, tolerating temperatures of around -15 to -20°C (5 to 1°F), once well established. It is more sensitive to cold in its youth.
Acorus calamus is a good choice for planting at the edge of a water feature or in a wet area, in wild or contemporary gardens. Pair it with Astilbes, Carex, Rodgersias or Filipendulas. Growing it in a large container, such as a zinc tub, also allows for the creation of a successful mini-aquatic garden by combining it with two or three shallow-water plants of contrasting shapes and colours, such as Cyperus papyrus 'Akhenaton'.
The dried rhizome has medicinal properties still used in parapharmacy and herbal medicine.
Acorus calamus in pictures
Flowering
Foliage
Plant habit
Botanical data
Acorus
calamus
Araceae
Sweet Flag, Calamus
West Asia
Planting and care
As with all aquatic plants or those that thrive in very wet soil, prefer spring planting. Sun or partial shade is suitable for Acorus calamus. For vigorous growth, it requires a rich soil, enriched with organic matter before planting, remaining moist or permanently submerged. Along the edge of a pond, the aromatic sweetflag should be planted at a shallow depth of water, up to 10-15cm (4-6in). Bury the rootstock to a depth of approximately 10cm (4in).
Dividing clumps and rootstocks should be done in spring. The rootstocks should be replanted immediately, as they do not tolerate dry conditions. Dividing clumps is recommended every four years to rejuvenate the plant.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
The planting period indicated on our website applies to regions in USDA Zone 9a (East Coast and Midlands: Dublin, Wexford, Waterford, Kilkenny, Portlaoise). It will vary depending on where you live:
- On the west coast and in the north-west (Galway, Limerick, Sligo, Donegal, Westport), delay planting by 1 to 2 weeks in spring and bring it forward by 1 to 2 weeks in autumn compared to the dates given, preferably choosing periods without strong winds.
- In the inland hills and plateaus (Wicklow Mountains, Macgillycuddy’s Reeks, Connemara, Killarney), it is best to plant in spring (April–May) or autumn (September–October), avoiding periods of waterlogged soil in winter and strong winds, which pose the main risk to newly planted trees in these areas.
The flowering period indicated on our website applies to regions in USDA Zone 9a, such as the East Coast and Midlands, including Dublin, Wexford, Waterford, Kilkenny and Portlaoise.
This will vary depending on where you live:
- On the west coast and in the northwest (Galway, Limerick, Sligo, Donegal and Westport), it will be delayed by one to two weeks compared to the given dates, due to stronger Atlantic winds and less spring sunshine.
- In the inland hills and plateaus (the Wicklow Mountains, the Macgillycuddy's Reeks, Connemara and Killarney), flowering will be delayed by two to three weeks. Flowering mainly occurs between May and July, with the limiting factors being less frost and more of the excessive humidity, strong winds and lack of sunshine that are characteristic of these areas.
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