Ceanothus arboreus

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Feltleaf ceanothus
Ceanothus arboreus 2.jpg
Scientific classification
Kingdom: Plantae
(unranked): Angiosperms
(unranked): Eudicots
(unranked): Rosids
Order: Rosales
Family: Rhamnaceae
Genus: Ceanothus
Species: C. arboreus
Binomial name
Ceanothus arboreus
Greene [1]
Ceanothus arboreus range map 2.png
Natural range of Ceanothus arboreus

Ceanothus arboreus is a species of shrub endemic to California, especially to the Channel Islands. It is known commonly as feltleaf ceanothus. It is a species of what are sometimes called California lilacs, and may be referred to as the California mountain lilac or island mountain lilac.


Ceanothus arboreus is a spreading bush growing up to 6 metres (20 ft) in height, bearing glossy dark green leaves which are leathery or felt-like on their undersides. It is sometimes planted as a fast-growing ornamental for its showy bright blue flowers, which grow in plentiful panicles, or bunches, of tiny five-lobed blossoms. Some varieties and cultivars have light, powder blue blooms, and others bear darker blue flowers. The fruits are three-lobed, triangular capsules.


'Ceanothus arboreus is cultivated as an ornamental plant. As a native of dry California, the plant is drought-tolerant and may be found in chaparral ecosystems.

Ceanothus arboreus

Numerous cultivars have been selected for garden use, of which 'Trewithen Blue' has gained the Royal Horticultural Society's Award of Garden Merit.[2]


  1. ^ C. arboreus was first described and published in Bulletin of the California Academy of Sciences, 2(6): 144. 1886. "Plant Name Details for Ceanothus arboreus". IPNI. Retrieved August 22, 2010. 
  2. ^ "RHS Plant Selector - Ceanothus arboreus 'Trewithen Blue'". Retrieved 26 June 2013. 

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