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Iris ensata Montrosa - Japanese Water Iris

Iris ensata Montrosa
Japanese Water Iris, Sword-leaved Iris, Butterfly Iris

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No flowers but shoots quietly growing...

Céline H., 06/09/2020

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This plant carries a 12 months recovery warranty

More information

Iris ensata 'Montrosa', with delicate white flowers edged in blue.
Height at maturity
80 cm
Spread at maturity
40 cm
Exposure
Sun, Partial shade
Hardiness
Hardy down to -29°C
Soil moisture
Moist soil, Damp soil
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Recommended planting time February to April, September to November
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Flowering time June
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Description

Beautiful delicate white flowers with wide blue borders.

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Iris ensata Montrosa - Japanese Water Iris in pictures

Iris ensata Montrosa - Japanese Water Iris (Plant habit) Plant habit

Flowering

Flower colour two-tone
Flowering time June
Flowering description Delicate white flowers with wide blue borders.

Foliage

Foliage persistence Deciduous
Foliage colour medium green
Foliage description Deciduous.

Plant habit

Height at maturity 80 cm
Spread at maturity 40 cm
Growth rate normal

Botanical data

Genus

Iris

Species

ensata

Cultivar

Montrosa

Family

Iridaceae

Other common names

Japanese Water Iris, Sword-leaved Iris, Butterfly Iris

Origin

Cultivar or hybrid

Product reference833211

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Planting and care

They thrive in a damp and marshy soil, without limestone. They also tolerate a fresh soil, even if not waterlogged, as long as it doesn't dry out in summer. On the other hand, they prefer a rather dry soil in winter. We have planted them near an artificial stream, which maintains a high water level during the warm season. In winter, we let the water level drop by about 15cm (6in), so that the stumps are above the water, just like in nature where river levels decrease in winter and rise again in spring with the melting of snow. Their cold resistance is excellent up to about -18° (-0.4°F). It is further enhanced if the soil is dry.

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Planting period

Recommended planting time February to April, September to November

Intended location

Type of use Border
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Amateur
Planting density 5 per m2
Exposure Sun, Partial shade
Soil pH Acidic, Neutral
Soil type Clayey (heavy), Silty-loamy (rich and light)
Soil moisture Moist soil, Damp soil, Clayey

Care

Overwinter Can be left in the ground
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