Perennial

Iris sibirica

Siberian Flag
Hardiness H7

Elegant blue to violet flowers rise above narrow grassy foliage on Iris sibirica in early summer. This hardy clump-forming perennial thrives in moisture-retentive soil and is especially useful beside ponds or through mixed borders where the ground does not dry out severely.

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Flowering Months
Jan J
Feb F
Mar M
Apr A
May M
Jun J
Jul J
Aug A
Sep S
Oct O
Nov N
Dec D
Size
Max Height
1.0 m — 1.5 m
Max Spread
0.1 m — 0.5 m
Growth Habit
Densely branched plant with compact, leafy, rounded overall shape.
Planting Position
Sunlight Indicates how much direct sunlight the plant needs each day. Full sun means 6+ hours, part shade is filtered or morning sun, and full shade is little to no direct sun.
Full Sun Part Shade
Aspect Aspect refers to the direction the planting spot faces (north, south, east or west). It affects light levels, warmth and exposure.
South East West
Exposure Exposure describes how sheltered or exposed a plant’s position is, particularly to wind and weather.
Exposed / Sheltered
Hardiness Hardiness indicates how well a plant tolerates cold conditions outdoors. Higher ratings generally mean greater frost tolerance.
(< −20 °C) Extremely hardy
Ideal Soil Conditions
Soil Type Soil type describes the texture of the soil (clay, sand, loam, chalk). This affects drainage, nutrients and how roots grow.
Chalk Clay Loam Sand
Soil Moisture Soil moisture tells you how wet or dry the soil should be for best growth. Match this to your garden conditions for healthier plants.
Moist but permeable / Free draining
Soil pH Soil pH measures how acidic or alkaline the soil is. It affects nutrient availability and can impact plant growth.
Acid Alkaline Neutral
Plant Uses & Merits
Uses
  • Patios / Courtyards
  • Coastal Areas
  • Flower Borders

Iris sibirica Description

Iris sibirica, Siberian iris, forms graceful clumps of narrow upright green leaves with slender flower stems appearing in early summer. The species typically carries blue to violet beardless flowers, while named cultivars extend the colour range considerably. Mature plants generally reach around 70cm to 1 metre high and gradually broaden with age. Grow in full sun or partial shade in fertile, humus-rich soil that remains consistently moist but is not permanently waterlogged. It is fully hardy and particularly well suited to Ireland’s cool, moist climate. Siberian irises combine well with grasses and other moisture-loving perennials and remain attractive after flowering. Remove spent stems and divide congested clumps in late summer or early autumn when flowering begins to decline.

Planting Guide for Iris sibirica

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Care guide for Iris sibirica

Items must be returned within 30 days after receiving your order. Items must be returned in the same condition in which they were received, be unworn/unused, have any tags still attached, and include all the original packaging.

Uses for Iris sibirica & Garden Styles it suits

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