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Iris America's Cup - Tall bearded Iris

Iris germanica America's Cup
German Iris, Bearded Iris

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More information

This all-white iris, including the beard, blooms in undulate petals with creamy reflections and in a slight sweet scent in the middle of the iris season, in May. Its tall flower stems, reaching a metre, are adorned with particularly bright corollas for two to three weeks. Ideal in a flower bed, it pairs well with all the flowers in the garden.
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
Recommended planting time February to April, September to November
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Flowering time May
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Description

Iris germanica 'America's Cup' is a white garden iris that has proven itself. This excellent variety produces large white flowers beautifully undulated, barely touched with cream reflections, with a white beard at the base, also with a lemon yellow base. Each rhizome produces a tall floral stem adorned with numerous delicately scented flowers that succeed each other for 2 to 3 weeks in spring.

 

Iris 'America's Cup' is a rhizomatous and deciduous perennial plant, with an upright tufted habit from spring. Its foliage disappears in winter. It 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 Iris have European origins.

'America's Cup' will reach a height of 1m (3ft) when flowering. Its sturdy floral stems bear numerous buds, guaranteeing a long flowering period, and the clump will spread without theoretical limit over time, with the central rhizomes thinning out in favour of the outer rhizomes. The foliage consists of long sword-shaped leaves, glaucous green and highly veined. Its flowering is slightly earlier than that of tall bearded irises. In April, floral stems appear, which will produce tightly packed flowers on the stems, blooming from the top downwards towards the lower branches. The colour of this plant is particularly pure and, as always with Garden Iris, enhanced by the texture of the petals and sepals, iridescent.

Obtained by McWhirter in 1988

 

To accompany irises, choose plants to associate with them based on their needs (exposure, soil...), their "respectful" vegetation towards irises (low plants or light foliage), and their decorative complementarity (appearance, flowering date). For example, Gaura will provide little shade to the irises and will keep the deflowered iris bed attractive throughout the summer. Eschscholzia will be satisfied with a dry and poor soil, just like the iris. Geraniums, salvias, and Libertia also go very well with irises. Slopes and terraced edges will be stabilized by a dense planting of old diploid 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, for example intermediates that are less likely to be knocked over than tall varieties.

At the base of a wall, the relative shelter from the wind allows for the use of tall irises, whose floral stems are sensitive to bad weather. The vegetable garden can be embellished with a few clumps or borders of irises because it is also the place for growing cut flowers.

Iris America's Cup - Tall bearded Iris in pictures

Iris America's Cup - Tall bearded Iris (Flowering) Flowering

Flowering

Flower colour white
Flowering time May
Inflorescence Spike
Fragrance slightly scented, sweet scent
Flowering description White with cream reflections, bearded white with a lemon yellow base.

Foliage

Foliage persistence Deciduous
Foliage colour medium green
Foliage description Deciduous.

Plant habit

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

Botanical data

Genus

Iris

Species

germanica

Cultivar

America's Cup

Family

Iridaceae

Other common names

German Iris, Bearded Iris

Origin

Cultivar or hybrid

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Planting and care

Do you have a sunny, warm, and rather dry location in the summer?
This is the ideal location for planting irises! In the shade, they vegetate 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. Soil that is too wet promotes rootstock rot. Plant from July to September. This gives the rootstocks enough time 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 the best result. Plan to divide irises every 4 years or so to give them fresh soil. They have vigorous growth and require space to develop and flower well. They are planted with spacing adapted to the size and vigor of the variety: about 34-50cm (13-20in) for tall ones (5 to 10 plants per square metre). In a monochrome planting, the rootstocks are planted in a staggered pattern. To create a mix of colours, it is recommended for the overall aesthetic of the iris bed to plant them in groups of several plants of the same variety. 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 to give them room to develop.

Planting

Dig a hole that is wide and deep enough. Make a conical mound of soil on which to place the rootstock and spread out the roots. Cover the roots. It is important that the rootstock is left just above the surface of the soil. It should not be planted in a hollow (risk of rot). Also, anticipate that the soil will settle and the iris will sink. In clay or wet soil, the rootstock may 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 thoroughly water it immediately after planting. Water 2-3 times if necessary until it takes root.

Maintenance:

Keep the soil weed-free by lightly hoeing, taking care not to damage the rootstocks or roots. Weeds cast shade on the irises, retain moisture (causing rot), and attract slugs. Similarly, remove dry leaves. If they are diseased (reddish-brown spots of heterosporosis), burn them. Remove faded flowers.

Planting period

Best planting time August
Recommended planting time February to April, September to November

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, Sandy, rocky, well-drained.

Care

Pruning instructions Cut the flowering stalks at the end of the flowering period. Cut the foliage diagonally halfway up in the 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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