Céanothe en thyrses (Ceanothus thyrsiflorus)

Publié lundi 28 janvier 2013 Commenter 66
Céanothe en thyrses

Sommaire

Céanothe en thyrses : en bref

Nom scientifique
Ceanothus thyrsiflorus
Provenance / Origine
Californie
Période de semi
Printemps
Période de floraison
Mai
Couleur de floraison
Bleu pâle à presque blanc parfois
Température
Climat assez doux mais peut supporter jusqu'à -10°C
Exposition à la lumière
Plein soleil
Reproduction
Semis, bouturage, (marcottage et greffe)
Hauteur
2 à 5m
Acidité du sol
Acide à faiblement calcaire
Entretien
Taille de mise en forme
Type biologique
Vivace
Maladies
Chlorose sur sol trop calcaire
Type de feuillage
Persistant
Insectes et animaux ravageurs
Cochenilles

Classification de la plante

Règne
Plantae
Sous-règne
Tracheobionta
Division
Magnoliophyta
Classe
Magnoliopsida
Sous-classe
Rosidae
Famille
Rhamnaceae

Un arbuste ornemental arrangeant

Introduit en 1837, Ceanothus thyrsiflorus est relativement peu exigeant et s’insérera très bien dans différents massifs floraux. Hermaphrodite, il présente une floraison très abondante d’inflorescences en bouquets bleutés, et est surnommé « Lilas de Californie » dans sa région d’origine. Ce céanothe est généralement moins rustique que d’autres espèces du même genre, mais il présente l’avantage d’être bien résistant à la pollution, et d’avoir un feuillage dense, ce qui complète la qualité esthétique de ses fleurs. Un sol trop calcaire risque de provoquer une chlorose (jaunissement des feuilles).

Un genre très variable

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Les céanothes présentent une grande variabilité de forme, de port, de feuillage et de couleur de floraison. Au sein même de l’espèce Ceanothus thyrsiflorus, différentes variétés existent, et en particulier une rampante : repens. Celle-ci tapisse les massifs, ne dépassant pas un mètre de hauteur, et constitue un très bon couvre-sol. Elle est par ailleurs bien plus rustique que les autres variétés ou espèces du genre.

Conseils pratiques

Si Ceanothus thyrsiflorus ne demande que très peu d’entretien (arrosage éventuel les premières années et taille de mise en forme seulement), sa multiplication nécessite de prendre quelques précautions pour être couronnée de succès. Privilégiez une stratification (quelques semaines au froid humide entre deux couches de terre) avant de semer. Pour effectuer un bouturage,  vous pouvez ajouter des hormones classiques de bouturage afin d’assurer la reprise. Le marcottage peut fonctionner, et la greffe doit être réalisée en demi-fente en août (porte-greffe fendu sur la moitié du diamètre et greffon taillé en biseau).

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