Is Phragmites australis invasive?

In many parts of North America, it is considered a highly invasive species that disrupts local wetland habitats.

Can I plant it in my garden?

It is strongly discouraged due to its aggressive spreading habit and potential to escape into local waterways.

Guide botanique

Common reed.

Phragmites australis

Prononciation frag-MY-teez oss-TRAH-liss

Aussi appelée Common Reed, Ditch Reed, Giant Reed, Phragmites, Reed Grass

Common reed — Photo de Douglas Goldman (CC BY-SA) via iNaturalist

This is a tall, perennial grass that thrives in wetlands and along shorelines. It spreads aggressively through underground rhizomes, often forming dense stands. It is considered an invasive species in many parts of North America.

En un coup d'œil

Niveau d'entretien: Facile
Type de plante: Perennial grass
Lumière: Full sun
Lumière en intérieur: Soleil direct
Arrosage: Tous les 1 à 3 jours
Taille adulte: 15 feet
Croissance: Rapide
Rusticité: USDA 4 à 10
Floraison: Late summer to early autumn

Entretien

This plant requires consistently moist or saturated soil to thrive. Keep an eye on its spread, as it can quickly overtake native vegetation in a garden setting. It is best suited for large, contained wetland areas rather than typical garden beds.

Arrosage: Keep the soil constantly wet or submerged in shallow water.
Engrais: Usually does not require supplemental fertilizer in natural wetland settings.
Taille: Cut back dead stalks in late winter or early spring to encourage fresh growth.
Rempotage: If grown in a container, divide the plant every year or two to prevent it from becoming root bound.
Sol: Wet, boggy, or marshy soil
pH du sol: 6.0 to 8.0
Température: -30 à 40°C
Humidité: 60 à 100%
Résistance à la sécheresse: Faible
Durée de vie: Perennial, can live for many decades through rhizomatous spread.
Résistance aux chevreuils et lapins: Élevée

Signes qu'il faut rempoter

Roots growing out of the drainage holes.
The plant becomes stunted due to lack of space.
The soil dries out too quickly.

Sécurité

Humains: It is not considered toxic to humans.
Enfants: The sharp, serrated edges of the leaves can easily cut a child's skin if they run through the stalks.
Allergènes de contact: The sharp leaf edges can cause minor skin abrasions if handled without gloves.
Allergènes aéroportés: The windborne pollen can trigger seasonal allergies in sensitive individuals.
Comestibilité: The young shoots are sometimes consumed, but they must be properly identified and prepared to avoid potential contamination from polluted water sources.

Comment l'identifier

Tall, rigid, hollow stems
Large, feathery, plume-like flower heads
Long, flat, lance-shaped leaves
Spreads via extensive underground rhizomes

Hauteur: 2 à 4m
Envergure: 1 à 5m
Feuilles: green, blue-green, deciduous
Fleurs: purple, brown, tan, 15 à 40cm
Fruits: brown, Autumn

Problèmes courants

Aphids — Small insects that feed on the sap of the leaves.

La cultiver

Multiplication: division, seed, rhizome cuttings
Quand planter: spring, autumn
Hivernage: The stalks turn brown and die back in winter, but the rhizomes remain dormant underground. You can cut the dead stalks to the ground in late winter to tidy the area.
En pot: It is not recommended for containers due to its massive root system and need for constant moisture.

Rhizome Division

1. Dig up a section of the rhizome in early spring.
2. Cut the rhizome into segments that include at least one node.
3. Plant the segments in moist soil at a depth of 5 cm.

Because this plant is so aggressive, it is best kept away from other garden plants that it might quickly smother.

Bonnes associations

Typha latifolia — They share similar wetland habitat requirements.
Common rush — It thrives in the same moist conditions as this grass.

Espèces similaires

Common reed — It is the primary species in the genus.

Science

Famille: Poaceae
Genre: Phragmites
Ordre: Poales
Classe: Liliopsida
Région d'origine: Cosmopolitan, found on every continent except Antarctica.
Préservation: While native in some regions, it is considered highly invasive in North America and is often subject to eradication programs.

It thrives in wet, nutrient rich soils and is highly effective at filtering water and stabilizing shorelines.

Intérêt pour la faune: nesting material for birds, larval host plant, cover for wetland wildlife
Pollinisateurs: abeilles, papillons, papillons de nuit
Utilisations: erosion control, wetland restoration, thatching material

Au fil des saisons

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Floraison

Fructification

Feuillage

Repères écologiques

Salinité: 4/9
Réaction du sol: 6/9
Lumière: 8/9
Température: 5/9
Humidité: 9/9
Nutriments: 7/9

Taxonomie vérifiée avec le GBIF.

Ce qu'on demande souvent

Is Phragmites australis invasive?: In many parts of North America, it is considered a highly invasive species that disrupts local wetland habitats.
Can I plant it in my garden?: It is strongly discouraged due to its aggressive spreading habit and potential to escape into local waterways.

D'où vient le nom

The name Phragmites comes from the Greek word phragma, meaning fence or hedge, referring to its dense growth habit. The specific epithet australis means southern.

Bon à savoir

It is one of the most widely distributed plants on the planet.
The rhizomes can grow up to 2 meters deep in the soil.
It has been used for centuries as a traditional material for roofing and baskets.

Aussi dans

Plantes que les cerfs ne mangent pas

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Ce guide a été généré par IA et vérifié avec la taxonomie du GBIF. Il s'agit d'informations générales, et non de conseils horticoles ou vétérinaires. Découvre comment nous concevons ces guides.