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Iris germanica Bistro - Bearded Iris

Iris germanica Bistro
Bearded Iris

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This iris flowers in May, before the peak bloom of the tall garden irises, on stems of about 70 cm. Its undulate golden yellow and mahogany brown flowers are enhanced by an orange-mustard beard. Well suited for border decoration, this variety also offers a good sweet fragrance. Plant it in full sun, in well-drained soil, even chalky and dry in summer.
Height at maturity
70 cm
Spread at maturity
40 cm
Exposure
Sun
Hardiness
Hardy down to -29°C
Soil moisture
Dry soil
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Best planting time July to October
Recommended planting time February to April, September to November
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Flowering time May
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Description

The Iris ‘Bistro’ is an intermediate bearded iris that flowers in a palette of warm tones, ranging from golden yellow, mahogany brown and mustard orange. Its medium stature places it between dwarf and tall bearded irises: it is highly visible in a border among the surrounding perennials, and its undulate flowers exude a pronounced sweet fragrance. This plant is well suited to beds without watering, slopes and scree gardens.

This variety belongs to the Iridaceae family. Cultivated garden irises, called Iris germanica, result from an ancient natural cross-breeding between two European irises, Iris pallida and Iris variegata. The bearded iris is a rhizomatous perennial: its fleshy rootstocks lie flush with the soil, store reserves and produce new leaves each year arranged in a fan. They can partly persist through winter, depending on the climate.

'Bistro' is a selection by Joseph Gatty, registered in 1998 by Keith Keppel and introduced in 1999. It originates from the cross between 'Quote' and a seedling from Keith Keppel. This variety received in 2003 an Honorable Mention from the American Iris Society, a distinction awarded by judges to irises noted for their good performance in cultivation. The plant forms an upright clump that expands by producing short rootstocks. It is formed of flat, broad, thick leaves, glaucous green to medium green. The flower stalks carry buds that open successively from top to bottom. Each flower displays three erect, strongly undulate inner petals and three broader, trailing sepals. The erect petals are golden yellow, like the style arms – those small floral parts visible at the centre of the flower. The sepals show a yellow background broadly covered with warm brown, with nuances of mahogany and henna towards the centre. A fine yellow edge outlines their contour. The beard is mustard, orange, with more tawny tones in the throat. The petals are beautifully undulate.

Plant this iris in full sun, in a border, rock garden or at the top of a slope. Allow the rootstocks to be flush with the soil and ensure they receive sunlight. You can associate this variety with Euphorbia characias ‘Black Pearl’, Nepeta ‘Kit Cat’, Salvia nemorosa ‘Schwellenburg’ and Stachys byzantina ‘Big Ears’. These perennials also like drained soil and sun; place groundcovers far enough away so as not to disturb the irises. The bed thus created remains decorative thanks to the grey or bluish foliage and summer blooms, without requiring much maintenance.

Our advice: divide the clumps in summer, every three to five years, when the centre flowers less or when the rootstocks become crowded.

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Garden iris, bearded iris: planting, care
Family sheet
by Virginie T. 13 min.
Garden iris, bearded iris: planting, care
Read article

Flowering

Flower colour two-tone
Flowering time May
Fragrance Fragrant sweet fragrance

Foliage

Foliage persistence Semi-evergreen
Foliage colour medium green

Plant habit

Height at maturity 70 cm
Spread at maturity 40 cm
Growth rate normal

Botanical data

Genus

Iris

Species

germanica

Cultivar

Bistro

Family

Iridaceae

Other common names

Bearded Iris

Origin

Cultivar or hybrid

Product reference26068

Planting and care

Plant the Iris ‘Bistro’ from July to October, when the rhizome can root before winter, or in spring in heavy soils that remain damp in autumn. Choose a very sunny position, with at least six hours of direct sunlight per day. Prepare a light, loose soil, rather rich, neutral to chalky or slightly acid, but above all well-drained. In clay soil, plant on a slight mound and mix gravel or coarse sand into the planting soil. Place the rhizome almost at the surface, with the back visible to the sun, then cover only the roots. Water after planting, then only during prolonged droughts in the first year. Remove faded flowers as they appear. Cut the flowered stems at the base, but keep healthy leaves until they turn yellow. Apply some well-rotted compost in spring, around the clump, without covering the rhizomes. Divide the clumps every three to four years, in summer, when the centre flowers less.

Planting period

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

Intended location

Suitable for Meadow, Rockery
Type of use Border, Edge of border, Slope
Hardiness Hardy down to -29°C (USDA zone 5) 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 well-drained, fairly rich

Care

Pruning instructions Cut the faded flower stems.
Pruning Pruning recommended once a year
Pruning time May
Disease resistance Good
Overwinter Can be left in the ground

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