About This Plant

The California lilac, or Ceanothus, is a diverse group of shrubs native to the western United States. They are known for their blue, purple, or white spring and summer flowers. California lilacs vary in size and shape, from ground cover varieties to small trees. They’re popular in gardens for their ornamental value and ability to attract pollinators. These shrubs thrive in dry climates and are low-maintenance once established, making them a great choice for water-conscious gardening.

The Story


The Ceanothus arboreus ‘Trewithen Blue’ features lance-shaped leaves measuring approximately 3 to 4 inches (7.6 to 10.2 cm) in length. These evergreen leaves showcase a vibrant, glossy green colour.


Ceanothus arboreus ‘Trewithen Blue’ is a evergreen shrub known for its striking blue flowers. The blossoms are small and clustered, forming dense panicles that adorn the branches. Each individual flower measures approximately 0.2 to 0.3 inches (5-8 mm) in diameter.
Home » Attractions » The Arboretum » Features » Californian Lilac