Yellow Flag Iris

Iris pseudacorus

Iris pseudacorus is a familiar plant, native to the British Isles, seen in ponds & damp ground. Its specific epithet, meaning "false acorus" refers to the similarity between its leaves and those of the Acorus calamus, being distinctly veined and sword-like in shape. The plant is tall, and very striking when in flower.
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Planning

Difficulty

Easy

Flowering time

Spring, Summer

Fruiting time

Autumn

Harvesting

Pick flowers in early summer.

Propagation

Seed

Can be sown in early spring in a cold frame in compost.

Division

Divide anytime from mid-summer to autumn and plant directly into the new location.

Special features

Attracts useful insects
Wet sites

Special features

Origin

Europe Western Asia, Northwest Africa

Natural climate

Temperate

Environment

Light

Full Sun, Partial Sun

Soil moisture

Wet

Soil type

Clay, Loam

Soil PH preference

Acid

Frost hardiness

Hardy

Uses

Medicinal

The root is said to have medicinal properties, but is toxic, so only ever through a medical practitioner.

Water treatment

This plant has been used as a form of water treatment since it has the ability to take up heavy metals through its roots and is featured in many AS Level Biology practicals as its ability to grow in low pH levels makes it a useful indicator.

Personality

Family

Iridaceae

Flower colour

Yellow

Scent

None

Problems

May be attacked by slugs, snails and thrips, but generally pest and disease free.

Companion plants

Plant with water loving or bog species.
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Knowledge and advice

Search our ever-growing knowledge base to find plants and information. Find out about pests and diseases you should be keeping an eye out for. Watch How to videos or follow step by step guides for tasks in the garden. Free download for your phone or tablet.
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