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Iris germanica Ola Kala - Bearded Iris

Iris germanica Ola Kala
German Iris, Bearded Iris

4,8/5
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Michèle E., 17/06/2019

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More information

Value-for-money
A variety of tall Garden Iris, which proudly displays its colour: a very bright, uniform yellow. Stunning in its simplicity!
Flower size
5 cm
Height at maturity
90 cm
Spread at maturity
40 cm
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Dry soil, Moist soil
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Best planting time September to October
Recommended planting time February to March, July to October
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Flowering time May to June
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Description

Iris germanica Ola Kala, sometimes called German Iris or Bearded Iris, is a variety of large Iris that proudly displays its colour: a very bright yellow. Absolutely stunning in its simplicity!

Immortalised by the great impressionists Van Gogh and Monet, Iris germanica, along with Nymphaea, is one of the most famous flowers in the world. It owes its popularity to both to their pictorial works and its unique design, further enhanced by its monochrome colour: a magnificent, very bright yellow.

Originally horticultural and belonging to the Iridaceae family, Iris germanica Ola Kala is a perennial plant with fleshy rhizomes. Its broad, sword-shaped leaves contrast with the crumpled appearance of its flowers, which are perched on sturdy stems. Together, they form a clump with upright stems that reach 90 cm (35 in) in height.

The flowers of Iris germanica have the characteristic of forming three large upright petals and three silky, trailing sepals, called a "beard". Flowering lasts for a few weeks and occurs in May/June.

Maintenance is relatively simple: just cut the flowers as they fade and, once all are faded, cut the stem 10 cm (4 in) from the ground, and in autumn, remove the dry, dead leaves. After a few years, the rhizome you have planted will die, leaving behind beautiful offspring. It will then be necessary to remove the dead part and divide the new rhizomes and replant them in another part of the garden. This operation should be repeated every 4 years or so.

Vigorous and resistant, German Iris thrives in a sunny position, in rather dry, light, and well-drained soil. It is not afraid of cold or summer drought, its only enemy being persistent humidity, especially in heavy soils.

Stunning in a sunny flower bed, it is also highly valued for making bouquets.

In the garden, it easily finds its place in a perennial flower bed, but you can also plant it en masse for a very strong visual effect, alone or accompanied by an Iris of another colour, such as Iris germanica Obsidian. It is also a plant that can occupy a flowery space in the vegetable garden, in the spirit of the French Curé gardens.

Iris germanica Ola Kala - Bearded Iris in pictures

Iris germanica Ola Kala - Bearded Iris (Flowering) Flowering
Iris germanica Ola Kala - Bearded Iris (Foliage) Foliage

Flowering

Flower colour yellow
Flowering time May to June
Inflorescence Cluster
Flower size 5 cm
Fragrance slightly scented, scent of lily of the valley

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 90 cm
Spread at maturity 40 cm
Growth rate normal

Botanical data

Genus

Iris

Species

germanica

Cultivar

Ola Kala

Family

Iridaceae

Other common names

German Iris, Bearded Iris

Origin

Cultivar or hybrid

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Planting and care

German Iris should be planted shallowly, leaving the rootstock exposed at ground level. Add sand when the soil is too heavy or too wet and place the rootstocks on small mounds. Ensure good drainage in the soil to prevent the iris from rotting. In summer, this iris should be watered 1 to 2 times a month. At the end of flowering, they should be pruned by cutting the flower stems 10 cm (4 in) above the ground. Damaged leaves should only be removed in autumn. It is not recommended to provide too much nitrogen as it weakens the plant and increases the number of leaves at the expense of flowers. The taller flower stalks become brittle. The iris can be susceptible to heterospory, a condition identified by brown oval spots. To prevent this, treat the iris with Bordeaux mixture at the beginning of the growing season. Every 4 years in summer, after flowering, divide the clumps by pulling up the entire plant. Transplantation should be done in an iris-free location for one year. Take the most beautiful young plants from the rootstock, usually those around the edges.

Planting period

Best planting time September to October
Recommended planting time February to March, July to October

Intended location

Suitable for Meadow, Rockery
Type of use Border
Hardiness Hardy down to -15°C (USDA zone 7b) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun
Soil pH Neutral, Calcareous
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, well-drained soil

Care

Pruning instructions Cut the flowering stems at the end of the flowering period. Cut the foliage at a diagonal halfway up in summer using secateurs.
Pruning Pruning recommended once a year
Pruning time July to August
Disease resistance Good
Overwinter Can be left in the ground
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