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Siberian iris

Iris sibirica · Iridaceae

The gardener's calendar

The right move for September

Ideal time to plant siberian iris: set it out when the soil is neither frozen nor waterlogged, and water generously as it establishes.

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ID card

Foliage
Deciduous, linear and delicate
Flowering
April to June, blue, purple or white flowers
Adult size
24 to 35 inches tall, 12 to 18 inches wide
Growth
Moderate
Hardiness
Very hardy, down to −35 °C
Origin
Siberia, Central and Eastern Europe
Soil type
Well-drained soil, slightly acidic to neutral

Care

Watering

Siberian iris appreciates consistently moist soil during growth, particularly in spring and summer. Reduce watering in fall and winter. Avoid waterlogging, which can rot the rhizomes.

Light exposure

Place your Siberian iris in full sun or partial shade. A sunny exposure promotes more abundant flowering and more intense colors.

Soil preparation

Prepare well-drained soil enriched with organic matter. This iris tolerates slightly acidic to neutral soils and prefers cool conditions. Improve drainage if your ground retains too much water.

Pruning and cleanup

Remove spent flowers to extend the flowering period. In fall, cut back dry foliage to ground level. Divide clumps every 3 to 4 years to rejuvenate plants and improve flowering.

Fertilization

A balanced fertilizer application in spring is generally sufficient. Supplement with well-decomposed compost on the surface when planting to enrich the soil long-term.

Diseases and pests

Siberian iris is very disease-resistant. Watch for rot in case of excess moisture. Slugs and snails can damage young shoots: protect them at the early growth stages.

Did you know?

Siberian iris bears the scientific name *Iris sibirica* but naturally occurs well beyond Siberia, throughout Central Europe. Irises have fascinated humanity since antiquity: the name "iris" comes from the Greek goddess Iris, messenger of the gods and the embodiment of the rainbow, referring to the shimmering diversity of flower colors.

Where to buy it

Plant in spring or early autumn, avoiding spells of intense heat. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, April, May, September.

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Tips generated and checked by Viridia — adapt them to your local climate.