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Iris sibirica Blue King - Siberian Iris

Iris sibirica Blue King
Siberian Iris, Siberian Flag

4,3/5
4 reviews
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The iris, which had remained small until today. I went to see it and there is a very small flower. Nothing like the image presented at the time of purchase. I'm attaching a photo. The young plant is 25cm (10in) tall and the flower measures between 5 to 7cm (2 to 3in) in diameter. A bit disappointed.

Marie-Thérèse, 18/05/2022

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This plant carries a 12 months recovery warranty

More information

Vigorous variety with large, very pure blue-violet flowers, veined with white at the throat. They are borne on slender stems dominating a dense and well-structured foliage that remains decorative from spring to autumn. Young plants of moist and sunny banks, this Siberian iris adapts to any soil as long as it is not dry and requires little maintenance.
Flower size
5 cm
Height at maturity
1.20 m
Spread at maturity
50 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -34°C
Soil moisture
Moist soil, Damp soil
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Best planting time March, October
Recommended planting time February to April, September to November
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Flowering time June
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Description

Iris sibirica Blue King is a majestic variety of Siberian iris that offers large and elegant flowers, in a very pure violet blue or royal blue colour, veined with white at the throat. They bloom in June, dominating a dense clump of leaves that remains beautiful for many months. Appreciated for their graceful flowers and graphic foliage, Siberian irises are vigorous and beautiful plants of wetlands, unlike their cousins Iris germanica. They are also very hardy irises, which will thrive in good garden soil. Irreplaceable near water, provided that the stumps are not submerged in winter, they are perfectly suitable for naturalistic, English, and even contemporary style gardens.

Iris sibirica 'Blue King' is a rhizomatous and deciduous perennial plant, with an upright tufted growth habit from spring. It belongs to the Iridaceae family. It is one of the many cultivars obtained from Iris sibirica, native to Central Europe, Eastern Europe, and Turkey (but absent from Siberia), and Iris sanguinea present in China, Siberia, Japan, Manchuria, and Korea. This blue iris will reach about 1.20 m (4ft) in flower, 70 cm (28in) in height for the foliage, and the clump will spread over about 50 cm (20in). Its growth is moderate, slower than that of Iris germanica. This plant has an erect, elegant growth habit, in a dense clump. The foliage consists of long, narrow leaves of a somewhat greyish green colour. In June, the floral stems project above the foliage, bearing solitary flowers with 3 sepals and 3 petals, succeeding from the tip of the stem to the lower branches. This iris spreads through rhizomes, its vegetation disappears in winter.

The 'Blue King' Siberian iris is perfect near a water feature or a stream, or simply in very wet soil. It can also be used in any type of garden that never completely dries out in summer. Its grace is perfectly suited to romantic gardens, English gardens, and other mixed borders. It can be associated with all plants that thrive in moist soil: summer snowflake, camassia, poet's narcissus, montbretia, daylilies, astilbes, meadowsweets, phlox, tall asters, meadowsweet, etc.

Iris sibirica Blue King - Siberian Iris in pictures

Iris sibirica Blue King - Siberian Iris (Flowering) Flowering
Iris sibirica Blue King - Siberian Iris (Foliage) Foliage

Flowering

Flower colour blue
Flowering time June
Flower size 5 cm

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 1.20 m
Spread at maturity 50 cm
Growth rate normal

Botanical data

Genus

Iris

Species

sibirica

Cultivar

Blue King

Family

Iridaceae

Other common names

Siberian Iris, Siberian Flag

Origin

Cultivar or hybrid

Planting and care

The 'Blue King' Siberian iris tolerates moist conditions, such as on a riverbank, as long as it is not permanently submerged. It can also be grown in ordinary garden soil, with a mulch and watering every 15 days in summer. It thrives in slightly acidic to slightly alkaline soil (pH 4.5 to 7.5), which is rich and well-drained. Soil that is too heavy with clay, too alkaline, or too sandy can be improved by adding a good amount of humus (well-decomposed compost).  An alkaline soil can be slightly acidified by adding heather soil or peat or pine needles.

Siberian irises require a sunny location to flower, with at least 6 hours of daily sunlight. In hotter regions, light shading during the hottest hours may be beneficial. It is best to plant during the dormant period, from late September to mid-April, avoiding frost periods. In warm climates, planting can be done in September. However, in regions with cold winters, planting should be done in late March or April. (They will only flower the following year). Planting can also be carried out in August.

Plant Iris Siberica rhizomes at a depth of 3-5 cm (1-2in). Siberian irises can remain in place without division for longer periods than bearded irises. They should only be divided every 5 to 10 years, when the clump no longer flowers in the centre or forms a crown. Sufficient space should be provided for the clumps to develop properly. On young clumps, systematically remove faded flower stalks. On well-established clumps, remove the stalks to prevent self-seeding from non-true-to-type offspring.

After autumn frosts, yellowed foliage can be cut back to 3-5 cm (1-2in) from the ground (and left in place as mulch). Alternatively, this dry foliage can be left during winter as an "architectural" element in the garden. It should only be cut back at the end of winter, in late February, before new leaves start to grow.

Planting period

Best planting time March, October
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow, Pond edge
Type of use Border
Hardiness Hardy down to -34°C (USDA zone 4) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun, Partial shade
Soil pH Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil, Damp soil, Cllay

Care

Pruning No pruning necessary
Disease resistance Good
Overwinter Can be left in the ground
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