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Yellow iris

Iris pseudacorus · Iridaceae

The gardener's calendar

The right move for September

Ideal time to plant yellow 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, bright green
Flowering
Spring to early summer (April-June)
Adult size
0.80 to 1.20 m in height
Growth
Fast and vigorous
Hardiness
Very hardy (down to -20°C)
Origin
Europe, Western Asia, Mediterranean basin
Soil type
Moist to very moist, even waterlogged
Exposure
Full sun to partial shade

Care

Watering

The yellow iris thrives in constantly moist soil, even saturated with water. If grown in a pot or flower bed, keep the substrate fresh during spring and summer growth. In winter, reduce watering slightly, but never let the soil dry out completely. It's an ideal plant for marshy areas or pond edges.

Exposure

Position your yellow iris in full sun to encourage abundant flowering and sturdy stems. It tolerates partial shade, especially in hot Mediterranean climates where light afternoon shade can prevent excessive drying. Less light will reduce the number of flowers.

Soil and substrate

This iris prefers soil rich in organic matter, neutral to slightly acidic. Drainage is not a priority: it adapts very well to waterlogged soils and flood-prone areas. Enrich the soil with compost or well-decomposed manure when planting.

Pruning and cleanup

Remove spent flowers as they fade to extend blooming. In late autumn or early winter, cut dry stems back to ground level. In spring, remove dead or damaged leaves to encourage new shoot emergence.

Nutrients

An application of well-decomposed compost or balanced fertilizer in spring is usually sufficient. If the soil is poor, distribute gentle organic fertilizer (granules, bone meal) early in the season. Avoid excess nitrogen, which would promote foliage at the expense of flowers.

Health and prevention

The yellow iris is generally very resistant. However, watch out for stagnant excess moisture in winter, which can promote rhizome rot in very enclosed environments. Divide clumps regularly (every 3 to 5 years) to maintain vigor and prevent overcrowding.

Did you know?

The yellow iris (Iris pseudacorus) is also elegantly known as the 'false acorus iris' in French. Historically, its rhizomes were used in tanneries and dyeworks, particularly to obtain black and gray tints. Some old sources even mention its use in traditional medicine, although its safety for ingestion is not established.

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.