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Iris Pinnacle - Bearded Iris

Iris germanica 'Pinnacle'
German Iris, Bearded Iris

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An ancient variety with fresh, daffodil colours. The snow-white petals surmount primrose yellow petals striped with white around a lemon-yellow beard with a white base. The flower is large, thick and beautifully formed. Its branching flowering stems reach a height of 90 cm (35in). Mid-season flowering.
Flower size
10 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 August to September
Recommended planting time February to March, July to October
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Flowering time May
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Description

Iris 'Pinnacle' is a variety of Garden Iris that caused a sensation when it was presented after the Second World War. Its large yellow and white flowers exude rediscovered happiness, like a spring smile. The plant forms beautiful clusters of light in the garden, at the heart of the iris season.

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

'Pinnacle' Iris reaches a height of 90 cm (35in) when in bloom. Each rhizome produces branched stems that bear several flower buds. The cluster spreads very quickly, theoretically unlimited over time, with the central rhizomes becoming bare in favour of the outer rhizomes. The foliage consists of long sword-shaped leaves, glaucous green and prominently veined. Floral stems appear in April and flower in May, in the middle of the tall iris season, blooming from the top to the lower branches. Each beautifully shaped flower consists of 3 upright petals of pure white, 3 drooping sepals of primrose yellow, slightly striped with white towards the throat, and 3 beards with a white base and a lemon-yellow tip. The very fresh colour is magnified by the thick and iridescent texture of the petals and sepals. 

Obtained by Jean Stevens in 1945 - Awards: Honorable Mention in 1949, Award of Merit (A.G.M) in 1951.

To accompany irises, choose plants based on their needs (exposure, soil...), their vegetation (low plants or light foliage, non-competitive plants), and their decorative complementarity (appearance, flowering date). For example, Gauras will cast little shade on the irises and will keep the faded iris bed attractive throughout the summer. California Poppies and Love-in-a-Mist will tolerate the same dry soil as the irises in summer. Perennial geraniums, salvias, and Libertia also accompany irises very well. Slopes, the base of small trees with light foliage, and the edges of terraces will be stabilized by a dense planting of old varieties that require little care. If the goal is more decorative and access for maintenance is possible, modern varieties can be chosen, such as intermediates that are less likely to be flattened by wind and rain.

The vegetable garden can be adorned with a few clusters or borders of irises for cut flowers.

Iris Pinnacle - Bearded Iris in pictures

Iris Pinnacle - Bearded Iris (Flowering) Flowering
Iris Pinnacle - Bearded Iris (Plant habit) Plant habit

Flowering

Flower colour yellow
Flowering time May
Inflorescence Cluster
Flower size 10 cm

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

'Pinnacle'

Family

Iridaceae

Other common names

German Iris, Bearded Iris

Origin

Cultivar or hybrid

Product reference177741

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Planting and care

Do you have a very sunny location, rather dry in the summer?
This is the ideal location for planting irises! In the shade, they grow but do not flower. They are hardy and do not need winter protection. Well-drained soil is perfect, even if dry and chalky, or even stony. Soil that is too wet promotes rootstock rot. Plant from July to September. This allows the rootstocks to establish new roots before winter. They should be planted as soon as they are purchased for best results. Plan to divide the irises every 4 years or so to give them fresh soil. They have strong growth and require space to develop and flower well. Plant with spacing adapted to the size and vigour of the variety: approximately 34-50 cm (13-20in) for tall ones. 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 develop.

Planting

Dig a hole that is wide and deep enough. Make a conical mound of soil in the hole, on which the rootstock and spread-out roots are placed. Cover the roots. It is important for the rootstock to be at the surface of the soil. It should not be planted in a basin (risk of rot). Take into account that the soil will settle and the iris will sink. In clayey or humid soil, the rootstock can even be left on a slight mound of a few centimetres. To make the soil adhere to the roots, lightly compact and water well immediately after planting. Water 2-3 times if necessary until establishment.

Maintenance:

Keep the soil free from weeds by shallow hoeing, taking care not to damage the rootstocks or roots. Weeds shade the irises, retain moisture (rot), and attract slugs. Likewise, remove dry leaves. If they are diseased (reddish-brown-bordered spots of heterosporiosis), we recommend burning 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, Rockery
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 after flowering. If desired, trim the foliage at a 45-degree (113°F) angle 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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