Canada thistle.

En un coup d'œil

Niveau d'entretien

Facile

Type de plante

Perennial herb

Lumière

Full sun

Lumière en intérieur

Soleil direct

Arrosage

Tous les 7 à 14 jours

Taille adulte

1 to 5 feet

Croissance

Rapide

Rusticité

USDA 3 à 9

Floraison

Late spring to early autumn

Entretien

This plant thrives in full sun and tolerates a wide variety of soil conditions. Keep an eye out for rapid spread, as it can quickly overtake other plants in your garden. Regular removal of the entire root system is necessary to control its growth.

Arrosage

Water deeply when the top inch of soil feels dry.

Engrais

Generally does not require supplemental fertilizer.

Taille

Cut back stems before they set seed to prevent spread.

Rempotage

Repot only if you are keeping it in a container to manage its spread.

Sol

Well drained, fertile soil

pH du sol

6.0 to 7.5

Température

-30 à 35°C

Humidité

30 à 80%

Sécurité

Humains

The plant is not considered toxic, but the sharp spines can cause significant mechanical injury to skin.

Enfants

The sharp, spiny foliage poses a significant risk of puncture wounds to children handling the plant.

Allergènes de contact

The sharp spines and stiff hairs on the leaves and stems can cause skin irritation or dermatitis upon contact.

Allergènes aéroportés

The windborne seeds have fine, feathery pappi that may cause respiratory irritation if inhaled in large quantities.

Comestibilité

While young leaves are sometimes consumed after careful preparation, the plant is generally considered unpalatable and potentially irritating.

Comment l'identifier

• Spiny, lobed, lance shaped leaves
• Small, fragrant, purple flower heads
• Extensive creeping underground root system
• Stems are smooth and lack spines

Hauteur

0,3 à 1,5m

Envergure

0,3 à 0,6m

Feuilles

green, deciduous

Fleurs

purple, pink, white, 1 à 2cm

Fruits

brown, late summer

Problèmes courants

• Rust — Fungal infection causing orange or brown pustules on the undersides of leaves.

La cultiver

Multiplication

seed, division, root cuttings

Quand planter

spring, autumn

Because this plant is so aggressive, it is best to avoid planting it near desirable garden species that it might crowd out.

Bonnes associations

• Achillée millefeuille — Both species thrive in similar open, sunny conditions.

Espèces similaires

• Bull thistle — It is a biennial species with much larger, more prominent spines.

Science

Famille

Asteraceae

Genre

Cirsium

Ordre

Asterales

Classe

Magnoliopsida

Région d'origine

Europe and northern Asia.

Préservation

It is widely considered an invasive weed and is often subject to mandatory control measures in many regions.

It thrives in disturbed soils and open fields, using its deep root system to outcompete other vegetation.

Intérêt pour la faune

nectar source, larval host plant

Pollinisateurs

abeilles, papillons, papillons de nuit

Utilisations

pollinator habitat, wildlife forage

Taxonomie vérifiée avec le GBIF.

Ce qu'on demande souvent

How do I get rid of it?

Consistent, repeated removal of the entire root system is necessary to exhaust the plant's energy reserves.

Is it a good plant for a garden?

It is generally not recommended for home gardens due to its aggressive, invasive nature.

D'où vient le nom

The genus name Cirsium comes from the Greek word for a thistle, while the species name arvense means of the field.

Bon à savoir

• It is one of the most persistent and difficult weeds to eradicate from agricultural land.
• The root system can extend several meters deep into the soil.
• It produces thousands of seeds that are easily carried by the wind.
• Despite its reputation, it is a vital nectar source for many native pollinators.