Acorus gramineus Ogon - Variegated Japanese Sweet Flag
Acorus gramineus Ogon - Variegated Japanese Sweet Flag
Acorus gramineus Ogon - Variegated Japanese Sweet Flag
Acorus gramineus Ogon - Variegated Japanese Sweet Flag
Acorus gramineus Ogon - Variegated Japanese Sweet Flag
Acorus gramineus Ogon - Variegated Japanese Sweet Flag
Acorus gramineus Ogon
Slender Sweet Flag
Arrived in a pot with a few leaves, just enough to dress up my flowerbed a little. It has established well in the soil. Planted a few weeks ago, it has already grown a bit. The tips of its leaves turn slightly yellow when it is thirsty, which is my cue to remember to water it. Planted in a bed with some marsh irises, which are also doing very well.
Leana, 05/04/2026
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Description
Acorus gramineus 'Ogon' is a lovely perennial plant that thrives in moist, marshy soil. It can be grown in fully submerged conditions, under 10 to 15 cm (5.9 in) of water, in full sun or partial shade. The plant's variegated foliage is dense and delicate and remains decorative for most of the year.
Emerging from the slightly trailing base are leaves that resemble an iris but are narrower and are of a beautiful chartreuse green colour highlighted with bright yellow. The green flowers are almost invisible and are grouped in a small, short spadix that appears at the beginning of summer. This plant is also known as the Japanese variegated Sweet Flag, and it quickly forms a large clump that complements Japanese irises, Asian primroses, or willowherbs on the banks of a pond. You can also plant it in a trough or a garden with particularly heavy and moist soil.
We have added a type of plant similar to Acorus gramineus 'Ogon' in one of our ponds, which has semi-evergreen leaves and is very useful as most waterside plants tend to disappear in winter. Although Acorus gramineus is known to be non-hardy, it has been outside for more than 20 years without any damage caused by the cold. However, in areas with colder winters, it is advisable to overwinter it in a cold greenhouse or a well-ventilated and bright space, protected from frost while keeping the soil consistently moist.
Acorus gramineus Ogon - Variegated Japanese Sweet Flag in pictures
Flowering
Foliage
Plant habit
Botanical data
Acorus
gramineus
Ogon
Araceae
Slender Sweet Flag
Cultivar or hybrid
Planting and care
Planting the Acorus gramineus 'Ogon' in crevices of damp rocks or along the banks of a pond for optimal growth is recommended. The soil should be heavy, moist or even marshy, and spring is the best time for planting. The plant should be put in a large pot or container with heavy soil in colder regions. It can be kept in a cold greenhouse or a well-ventilated, bright area protected from frost. It's essential to keep the soil consistently moist.
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).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
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 planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
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.
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