Rosebay Willowherb · Chamaenerion angustifolium

Photo: kallerna · CC BY-SA 3.0 ↗

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WildflowersSeen in the wild

Chamaenerion angustifolium

Rosebay Willowherb

Tall pink-purple spires colonise clearings, then release white seed fluff from splitting autumn pods.

See all four seasons Explore fruits, seeds & edibility ↓ Where to look & how to find it ↓

Some plants are poisonous. Do not identify by a photograph alone, and never taste them.

FIELDCRAFT · FIND WITH CARE

Finding guide

Season first

Choose the season, find the habitat, then watch patiently. Search guidance is not a measure of rarity or conservation status.

When to go: Usually flowers June–September; seed fluff in autumn.
Where to start: Irish clearings and roadside ground. Observe from public paths, never from railway property.
What to do when you arrive: In summer, view tall pink spikes from roads or woodland tracks, then look for long capsules and seed fluff. Never enter railway land, however visible the flowers.

Habitat and behaviour reference: Wildflowers of Ireland ↗ · The practical steps are editorial advice based on the references, not live sightings.

ONE PLANT · FOUR SEASONS

One plant. Four seasons.

Look beyond the flowers: fresh leaves, fruits, bare stems and dormancy.

Meteorological seasons: spring March–May, summer June–August, autumn September–November and winter December–February. Irish weather, cultivar, pruning and plant age affect timing and appearance.

Photos illustrate the relevant feature, not the same plant photographed through a year in Ireland. Features shared across seasons, such as evergreen leaves, may use the same reference. Missing reliable photos are marked; dormancy is not death.

Spring

Mar–May

Foliage and growth

Rhizomes send up shoots with narrow leaves arranged along the stems.

Summer

Jun–Aug

Flowers

Pink-purple four-petalled flowers open progressively upward along lengthening spikes.

Autumn

Sep–Nov

Seeds and spent flowers

Long pods split to reveal conspicuous white seed fluff, often above reddish leaves.

Winter

Dec–Feb

Feature photo not yet availableUse the appearance notes below; a different seasonal stage is not substituted.

Bare branches or dry stems

Dry tall or collapsed stems may remain, with living growth mainly below ground.

Seasonal references: Wildflowers of Ireland ↗ · Photo resized, converted to JPEG and stripped of metadata.

FRUIT · SEED · FOOD SAFETY

Fruits, seeds & edibility

Know the structure, then the part. Recognising a plant does not make it food.

Fruit

Rosebay Willowherb · Split capsules and silky-haired seeds. — Split capsules and silky-haired seeds.
Dcrjsr · CC BY 3.0 ↗ License terms

Long, often reddish capsules split into valves that curl outward when mature.

Food use of this part: Food safety not established by this guide

Seeds & dispersal units

Many tiny seeds carry white silky hairs for wind dispersal.

Food use of this part: Food safety not established by this guide

Some seed references show intact one-seeded fruits or dispersal units, as identified in their captions. A whole-fruit photo is not a close-up of the enclosed seed. Cones and arils are not true fruits of flowering plants.

Sources & limitations

Wildflowers of Ireland ↗ · Botanical description, not proof of food safety
NC State Extension · Plant Toolbox ↗

No field detoxification methods or safe doses are provided. Never taste a plant to identify it or eat treated or contaminated specimens. Seek professional help after suspected accidental ingestion. National Poisons Information Centre, Ireland ↗

Photo resized, converted to JPEG and stripped of metadata.

BOTANICAL NOTESPlant notes

How to identify it

Four-petalled pink-purple flowers open progressively along long spikes; narrow leaves and slender pods that split to expose hairy seeds.

Where it grows

Disturbed ground, woodland edges, railway banks and verges.

Growth and ecology

A rhizomatous perennial readily colonising open ground; seeds travel on the wind.

Flowering and seasons

Usually flowers June–September; seed fluff in autumn.

Where to look

Irish clearings and roadside ground. Observe from public paths, never from railway property.

Seasons vary with weather and location. Suggested habitats are places to look, not guaranteed sightings. Photos show only some features; check leaves, flowers, fruits and specialist references together.

Further reading:Wildflowers of Ireland ↗

Photo license: kallerna · CC BY-SA 3.0 ↗ · License terms ↗
Photo resized, converted to JPEG and stripped of metadata.

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