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Iris germanica Frison-Roche - Bearded Iris

Iris germanica Frison-Roche
German Iris, Bearded Iris

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A tall (1m (3ft)) Bearded Iris which produces large and elegant flowers with ample undulations, in pure white colour, adorned with ivory beards. This is a rather early variety, with a sweet floral fragrance.
Flower size
12 cm
Height at maturity
1 m
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 August to September
Recommended planting time February to March, July to October
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Flowering time May
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Description

The 'Frison-Roche' German Iris is a majestic white bearded iris dedicated to the famous eponymous mountain guide who conquered the highest peak in Western Europe. This variety produces large and beautiful undulate snow-white flowers, discreetly speckled, with ivory beards, and a sweet floral fragrance. Its flowering, rather early, dominates spring flowerbeds with its impressive height. A prestigious name, well carried by this award-winning variety.

The 'Frison-Roche' Iris is a perennial rhizomatous plant that develops in spring in elegantly upright clumps, with foliage disappearing in winter. It belongs to the Iridaceae family. It is one of the many cultivars obtained over the centuries whose disputed origins revolve around the number of chromosomes in potential ancestors. It can be noted that Bearded Irises have European origins. They are plants that thrive in alkaline soils, craving sunlight - their rhizomes must 'cook' in summer in order to flower. A minimum of 6 hours of sunlight per day is generally required.

The 'Frison-Roche' iris will reach a height of 105 cm when flowering, making it one of the tallest varieties. The clump will spread indefinitely over time, with the central rhizomes becoming bare in favour of the outer ones. The foliage consists of long and wide sword-shaped leaves, of a slightly glaucous green, with parallel veins running through them. In April floral stems appear which will bear large, well-proportioned and pleasantly undulated flowers at the beginning of May, opening from the top down towards the lower branches. Discreet green veins extend from the throat of the flower towards the periphery of the sepals. The colour of the plant is, as always with Bearded Irises, enhanced by the thick and iridescent texture of the floral parts.

Created by Cayeux, 1995

Award: 4th prize at the Florence competition in 1997.

To accompany your irises, choose plants based on their similar needs (sunlight, soil), a growth habit that is "respectful" of irises (i.e. non-competitive plants which are shorter, have light foliage), and how they complement each other visually (appearance, flowering period). For example, Gauras won't create shade, and will keep the bed attractive all summer after your irises have finished flowering. California poppies and love-in-a-mist will thrive in the same dry soil as the iris. Geraniums, salvias, and Libertia also complement them very well. Slopes and terraced edges can be stabilised by densely planting old diploid varieties that can remain in place and require little care. If the goal is more decorative and access for maintenance is possible, you can choose more modern varieties, such as intermediates that are less likely than tall ones to be flattened by wind and rain.

The vegetable garden can be embellished with a few clumps or borders of irises, as it is also the classic place for growing flowers for cutting.

Flowering

Flower colour white
Flowering time May
Inflorescence Cluster
Flower size 12 cm
Fragrance slightly scented, Floral and gentle

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 1 m
Spread at maturity 40 cm
Growth rate fast

Botanical data

Genus

Iris

Species

germanica

Cultivar

Frison-Roche

Family

Iridaceae

Other common names

German Iris, Bearded Iris

Origin

Cultivar or hybrid

Product reference163081

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Planting and care

Does your garden have a sunny area, sheltered from the wind, that is warm and rather dry in summer? This is the ideal location for planting irises! In the shade they will grow but do not flower. They are hardy and do not need winter protection. Well-drained soil is perfect, even if it is rather dry. Iris germanica require alkaline soil: amend yours with lime if it tends to be acidic. Excessively wet soil promotes rhizome rot. Plant from July to September: this allows the rhizomes to grow sufficiently before lifting, and to develop new roots before winter. For best results they should be planted as soon as they are purchased. Plan to divide the iris every 4 years or so to give them fresh soil. They have strong growth and need space to develop and flower well. They are planted with spacing appropriate to the size and vigour of the variety: about 34-50 cm (13-20in) for tall ones (5 to 10 plants per square metre). In a monochrome planting, the rhizomes are planted in a staggered pattern. When mixing colours, it is recommended for the overall aesthetics of the iris bed to plant them in groups of several plants of the same variety. Always consider the direction of rhizome growth by arranging them in a star shape, with buds and leaves facing outward, and spacing them well in relation to other varieties so they have room to develop.

Planting:

Dig a hole that is wide and deep enough for the roots. Make a large conical mound of soil in the hole, on which the rhizome and spread-out roots are placed. Cover the roots. It is important that the rhizome is left just above the surface of the soil. It should not be planted in a depression (risk of rot), so anticipate that the soil will settle and the iris will sink. In clayey or damp soil, the rhizome should even be left raised on a slight mound of a few centimeters. To make the soil adhere to the roots, lightly compact the soil and water it abundantly after planting. Water 2-3 times if necessary until the plant establishes.

Maintenance:

Keep the soil weed-free by shallow hoeing, taking care not to damage the rhizomes or roots. Weeds shade the irises, retain moisture (leading to rot), and attract slugs. Likewise, remove dry leaves. If they are diseased (reddish-brown spotted with heterosporiosis), burn them. Remove faded flowers.

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Planting period

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

Intended location

Suitable for Meadow
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, alkaline.

Care

Pruning instructions Cut the flowering stems at the end of the flowering period. If desired, trim the foliage at a slant halfway up in summer using pruning shears.
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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