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Value-for-money

Iris Blue Denim - Dwarf bearded Iris

Iris pumila Blue Denim
Dwarf bearded Iris

4,7/5
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Nice young plant received quickly in perfect condition, beautiful recovery.

Murielle, 11/12/2024

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Iris 'Blue Denim' is a lovely variety of dwarf iris, forming beautiful little clusters of flowers in April. Its bearded flowers are a light blue with subtle violet highlights. A vibrant variety, bringing a touch of blue to borders, banks, and rockeries.  
Height at maturity
25 cm
Spread at maturity
20 cm
Exposure
Sun
Hardiness
Hardy down to -15°C
Soil moisture
Dry soil
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Best planting time September to October
Recommended planting time February to March, July to October
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Flowering time April to May
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Description

Iris 'Blue Denim' is a lovely variety of dwarf iris, forming beautiful small flowering clumps in April. Its bearded flowers are light blue with subtle purple highlights. A vibrant variety that adds a touch of blue to borders, slopes, and rockeries.

 

Iris 'Blue Denim', or Lilliput Garden Iris 'Blue Denim', is a rhizomatous and deciduous perennial plant with an upright clumping habit from spring. It belongs to the Iridaceae family. It is one of the many modest-sized cultivars that appeared in the 1950s. Originally, the 'lilliput' category referred to the cross-breeding of an Iris pumila and a tall iris. This term now generally refers to the category of Standard Dwarf Bearded (SDB) Irises. 'Blue Denim' will reach 25 to 30 cm (10 to 12in) high in bloom, with numerous buds, and the clump will spread without a theoretical limit over time, with the central rhizomes becoming bare in favour of the outer rhizomes. It has dense clumping foliage of long, sword-shaped, glaucous green leaves with prominent veins. Floral stems appear in March which bloom in April, amidst the rockery iris season, blooming from the top downwards towards the lower branches. The colour is enhanced by the silky texture of the petals and sepals.

 

To accompany irises, choose plants based on their requirements (exposure, soil...), vegetation (low-growing or light foliage), decorative appearance and flowering period. For example, Gaura will cast little shade on the irises and will keep the faded iris bed attractive throughout the summer. Eschscholzia will be happy with the same dry and poor soil as irises. Geraniums, salvias, and Libertia also pair well with irises. Slopes and terraced edges can be stabilised by dense plantings of old diploid varieties that require little care. If the goal is more decorative and access for maintenance is possible, one can choose more modern varieties, such as intermediates, which are less likely to be knocked over.

Path Edging: The entire range can be used, from early dwarfs under 40 cm (16in) to tall irises over 75 cm (30in) that bloom in May, including intermediates (in size and earliness) and border irises, which are medium-sized but bloom with the tall ones. Tall irises may need staking to prevent them from being flattened.

Border Planting: The domain of irises... border irises, but also dwarfs, depending on the circumstances.

Mixed Border: The entire size range can be used, to be chosen based on placement (front, back) and the size of neighbouring plants.

Iris Blue Denim - Dwarf bearded Iris in pictures

Iris Blue Denim - Dwarf bearded Iris (Flowering) Flowering
Iris Blue Denim - Dwarf bearded Iris (Foliage) Foliage
Iris Blue Denim - Dwarf bearded Iris (Plant habit) Plant habit

Flowering

Flower colour blue
Flowering time April to May
Inflorescence Cluster

Foliage

Foliage persistence Deciduous
Foliage colour medium green

Plant habit

Height at maturity 25 cm
Spread at maturity 20 cm
Growth rate normal

Botanical data

Genus

Iris

Species

pumila

Cultivar

Blue Denim

Family

Iridaceae

Other common names

Dwarf bearded Iris

Origin

Cultivar or hybrid

Product reference884821

Planting and care

Do you have a sunny, warm location, dry in summer?
This is the ideal location for iris! In the shade, they grow but do not flower. They are hardy and do not need winter protection. Well-drained soil is perfect, even dry and chalky. Soil that is too wet promotes rhizome rot. Plant from July to September. This gives the rootstocks enough time to grow and develop new roots before winter. They should be planted as soon as they are purchased for best results. Plan to divide iris every 4 years or so to give them fresh soil. They have vigorous growth and require space to develop and flower well. Plant them with spacing appropriate to the size and vigour of the variety: about 34-50 cm (13-20in) for tall varieties. In a monochrome planting, the rootstocks are planted in a staggered pattern. To create a mix of colours, plant them in groups of several plants of the same variety. Always consider the direction of growth of the rootstocks, arranging them in a star shape with buds and leaves facing outward, and spacing them well away 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 rhizome and spread-out roots are placed. Cover the roots. It is important for the rhizome to be left just above the surface of the soil. It should not be planted in a dip (risk of rot), so anticipate that the soil will settle and the iris will sink. In clayey or moist soil, the rhizome can even be left elevated on a slight mound. To make the soil stick to the roots, lightly firm and water thoroughly after planting. Water 2-3 times if necessary until the plant takes root.

Maintenance:

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

16
€14.50 Each
6
€19.50

Planting period

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

Intended location

Suitable for Meadow, Rockery
Type of use Edge of border, Container, 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, Well-drained soil

Care

Pruning instructions Cut the stems at the end of flowering. Cut the foliage at a slant halfway up in the summer.
Pruning Pruning recommended once a year
Pruning time July to August
Disease resistance Good
Overwinter Can be left in the ground
4,7/5
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