Iris versicolor Kermesina - Water Iris
Iris versicolor Kermesina - Water Iris
Iris versicolor Kermesina
Blue Flag, Boston Iris
Planted in May on the bank of a stream, the irises have grown well but have not flowered. I’m waiting for next June.
Pascale, 10/11/2025
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Description
Iris versicolor 'Kermesina' is a perennial rhizomatous plant for wet areas with intriguing flowering, textured with white.
Belonging to the large Iridaceae family, the type variety is native to the large wet plains and marshes of North America. It is common in carex meadows, swamps, and along riverbanks. It is also one of the few native species that can be cultivated without difficulty. In spring, the deciduous ensiform (sword-shaped) leaves grow to a width of 2.5cm (1in), followed very quickly by the flowering. This flowering occurs from May to July, with 5 to 6 velvety-textured flowers per stem, reaching a height of 60cm (24in). Petals, sepals, and styles are delicately reticulated with a plum colour and white. The sepals are scalloped with yellow-green at their base. Narrow and horizontal at the base, they suddenly widen into a triangular, elegantly curved section. The flowers are medium-sized, approximately 10cm (4in) in width. They have a very light powdery fragrance typical of irises, but less pronounced than in their counterparts.
Iris versicolor 'Kermesina' thrives in full sun or partial shade. As a pond plant, it will reach its full potential with its feet in 5 to 10cm (2 to 4in) of permanent water. Unlike I. germanica, which does not like excess water, this one particularly seeks it. In any case, it is one of the species best adapted to cultivation in wet and humus-rich soils. It is very easy to cultivate and, once established, is very hardy and requires little maintenance. The plants need two years before the first flowering, but the highly cut-out silhouette of its inflorescences and its wild freshness are well worth the wait. Afterwards, the rhizomes can be divided every three years. At the end of flowering, cut back the stems. You can reintroduce it to its natural environment. I. versicolor can be found in carex meadows. You can vary the colours and shades of the different varieties of this grass. On the edge of a pond, consider planting with other water irises, such as I. pseudacorus, I. chrysographes 'Black Knight', and then introduce concentric circles of purple or pearly astilbes, Provence canes, and bearded irises. They all love pond edges.
Everything refers to colour in the denomination of the 'Kermesina' variety. In Greek mythology, Iris was the messenger between Earth and the gods of Olympus. Today, with more than 200 varieties in a wide spectrum of colours, the iris proudly bears the name that designates the rainbow in Greek. Closer to us, I. versicolor designates a plant whose colours fluctuate. 'Kermesina' simply means crimson or violet with a hint of red, and describes plant varieties whose flowers have this colour.
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Iris versicolor Kermesina - Water Iris in pictures
Flowering
Foliage
Plant habit
Botanical data
Iris
versicolor
Kermesina
Iridaceae
Blue Flag, Boston Iris
North America
Planting and care
Although growing in marshes, waterlogged meadows or even with its feet in the water, this iris thrives well in slightly moist garden soil.
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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