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Iris germanica Blue Rhythm - Bearded Iris

Iris germanica Blue Rhythm
German Iris, Bearded Iris

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Hello, This iris is not 'Blue Rhythm'. Blue Rhythm is a very famous variety, created in 1945 by Agnes Whiting and awarded the 1950 American Dykes Medal (highest international accolade). You can verify it here: https://wiki.irises.org/TbAthruE/TbBlueRhythm The iris presented here is most likely a clone of Iris xgermanica, impossible to specify further from just one image. Best regards, Sophie

Sophie , 24/07/2023

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A tall, old, vigorous Garden Iris with a long flowering period and a lemon-scented fragrance. This mid-season variety produces large flowers in May and June, with a thick texture and a medium blue color that resembles cornflower blue, softened by a silvery shade. The beards are white, with a yellow-orange base. Its flower stems reach a height of 95cm (37in). Majestic in the garden!
Flower size
12 cm
Height at maturity
95 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 August to September
Recommended planting time February to March, July to October
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Description

Iris germanica 'Blue Rhythm' is an old variety of Garden iris that has won several awards and continues to impress gardeners with its vigour, beautiful blue colour, and long-lasting fragrant flowering. Its flowers are large, spacious, and light, with firm and iridescent texture, and their magnificent colour approaches a true medium blue. Among the tallest, flowering for a long period, 'Blue Rhythm' is a remarkable garden plant, as elegant as it is romantic. Stunning with lavenders or Perovskias.

Iris 'Blue Rhythm' is a rhizomatous perennial that forms upright clumps. Its deciduous foliage disappears in autumn and reappears in spring. This plant belongs to the family Iridaceae. It is one of the many cultivars obtained over the centuries, whose controversial origin is discussed around the number of chromosomes of potential ancestors. It should be noted that Garden Iris has European origins.

The 'Blue Rhythm' Iris is a tall variety that reaches 95cm (37in) in height when flowering. Each rhizome produces a well-branched stem that carries numerous flower buds. The clump spreads very quickly, with no theoretical limit over time, with the centre rhizomes becoming bare in favour of the outer ones. The foliage consists of long sword-shaped leaves, glaucous green in colour, strongly veined. In April, floral stems appear that will produce flowers from May to June, in the middle to the end of the Garden Iris season, blooming from the top to the lower branches. This 'Blue Rhythm' variety has a pleasant lemon fragrance.

Obtained by Mme C. Whiting,1945 - Awards: Honorable Mention in 1945, Award of Merit in 1947 and Dykes Medal in 1950.

To accompany irises, choose plants to associate based on their needs (exposure, soil...), their "respectful" growth with irises (low plants or light foliage, non-competitive plants), and their decorative complementarity (appearance, flowering time). For example, Gauras will provide little shade to the irises and will keep the deflowered iris bed attractive throughout the summer. California Poppies and Love-in-a-Mist will tolerate the same dry soil as the iris in summer. Perennial geraniums, salvias, and Libertias also complement irises very well. Slopes, the base of small trees with light foliage, and terraced edges will be stabilized by a dense planting of old varieties that can remain in place and require little care. If the goal is more decorative and access for care is possible, one can choose more modern varieties, such as intermediates that are less likely than tall ones to be literally laid flat by wind and rain.

The vegetable garden can be adorned with a few clumps or borders of irises, as it is also the place dedicated to growing cut flowers.

Flowering

Flower colour blue
Flowering time May
Inflorescence Cluster
Flower size 12 cm
Fragrance slightly scented, Lemon.
Flowering description Large silvery, cornflower blue. Fragrant.

Foliage

Foliage persistence Deciduous
Foliage colour medium green
Foliage description Glaucous, deciduous.

Plant habit

Height at maturity 95 cm
Spread at maturity 40 cm
Growth rate normal

Botanical data

Genus

Iris

Species

germanica

Cultivar

Blue Rhythm

Family

Iridaceae

Other common names

German Iris, Bearded Iris

Origin

Cultivar or hybrid

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Planting and care

Do you have a very sunny, rather dry location in the summer?
This is the ideal location for planting irises! In the shade, they grow but do not flower. They are grown in all regions. Hardy, they do not need winter protection. Well-drained soil is perfect, even if it is rather dry and chalky, or even rocky. Too much moisture promotes rootstock rot. Plant from July to September. This allows the rootstocks to grow sufficiently before being dug up, and to develop new roots before winter. They should be planted as soon as they are purchased, for better results. Plan to divide the irises 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 adapted to the size and vigour of the variety: approximately 34-50cm (13-20in) for the tall ones (5 to 10 feet per square metre). Always consider the direction of growth of the rootstocks by arranging them in a star shape, with buds and leaves facing outward, and spacing them well from other varieties so they have room to grow.

Planting

Dig a hole that is wide and deep enough. Make a conical mound of soil in it, on which the rootstock and spread-out roots are placed. Cover the roots. It is important for the rootstock to be level with the surface of the soil. It should not be planted in a depression (risk of rotting). Take into account that the soil will settle and the iris will sink. In clayey or damp soil, the rootstock will even be left elevated on a slight mound of a few centimetres. To make the soil adhere to the roots, the soil is lightly compacted and heavily watered immediately after planting. Water if necessary 2-3 times until it establishes.

Maintenance:

Keep the soil weed-free by shallow hoeing, taking care not to damage the rootstocks or roots. Weeds shade the irises, retain moisture (rotting), and attract slugs. Similarly, remove dry leaves. If they are diseased (reddish-bordered spots of heterosporiosis), we recommend burning them. Remove faded flowers.

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, Slope
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. If desired, cut 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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