Acorus gramineus Hakuro-nishiki
Acorus gramineus Hakuro-nishiki
Acorus gramineus Hakuro-nishiki
Acorus gramineus Hakuro Nishiki
Grassleaf sweet flag, Japanese rush, Grassy-leaved sweet flag
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Description
Acorus gramineus 'Hakuro-nishiki' is a variety of miniature Acorus with bright foliage, ideal for illuminating dark areas. It forms a fan-shaped clump composed of fine and elegant foliage, glossy, variegated green and yellow, with a golden appearance. Semi-aquatic, often used for ornamental purposes around water features, this semi-evergreen perennial, similar to a grass, offers dense and decorative foliage for most of the year. It can be grown in damp soil or with the stump submerged under 10 to 15cm (4 to 6in) of water. Acorus is perfect for stabilizing banks and embellishing small ponds.
Acorus gramineus 'Hakuro-nishiki' is a plant from the Acoraceae family. Its wild ancestor is native to Japan, Korea, and Eastern Asia. From the slightly trailing stump emerge leaves reminiscent of iris leaves, but narrower, leathery, thick, glossy, with golden reflections. It has an aromatic fragrance when crushed, with a pleasant aniseed scent and a hint of liquorice. The rhizomes, used in traditional Japanese medicine, are also fragrant: their scent more clearly resembles that of liquorice. This slow-growing perennial plant is not invasive. 'Hakuro-nishiki' is a well-established variety, forming a spreading clump 10 to 15cm (4 to 6in) tall and 20cm (8in) wide. The greenish flowers are almost invisible, clustered in a short spadix and appear at the beginning of summer.
This Japanese Rush complements Japanese irises, Asian primroses or willowherbs on the banks of a pond. Similarly, you can also plant it in a trough or in a garden with particularly heavy and moist soil. We have planted a variegated Acorus gramineus variety in one of our ponds where its semi-evergreen foliage is very useful, as it must be recognized that most bankside plants disappear in winter. Acorus gramineus is reputed to be non-hardy, but it has been outside for over 20 years and does not suffer from the cold. In regions with cold winters, it is preferable to overwinter it in a cold greenhouse or in a well-ventilated and bright place, protected from frost, while keeping the soil always moist.
Acorus gramineus Hakuro-nishiki in pictures
Flowering
Foliage
Plant habit
Botanical data
Acorus
gramineus
Hakuro Nishiki
Araceae
Grassleaf sweet flag, Japanese rush, Grassy-leaved sweet flag
Cultivar or hybrid
Planting and care
Acorus gramineus 'Hakuro-nishiki' is preferably planted in spring, in a semi-shaded or sunny, but not scorching, exposure. Install it in crevices of dripping rocks or on the shores of a pond, in heavy, moist, or even marshy soil. In cold regions, put the young plant, with a clod of soil, in a large pot or some kind of bowl. Place it in a cold greenhouse or a well-ventilated, bright place protected from frost. The soil should be kept constantly wet.
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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