Ceanothus arboreus

Ceanothus arboreus, commonly known as California lilac or tree lilac, is a large evergreen shrub or small tree native to California and Oregon. Belonging to the Rhamnaceae family, it can grow up to 20 feet tall with a spread of 10-15 feet. The plant features glossy, dark green, oval-shaped leaves with serrated edges. In spring, it produces clusters of fragrant blue flowers that attract bees and butterflies. Ceanothus arboreus thrives in full sun but can tolerate partial shade. It prefers well-drained soil and requires moderate watering during its growing season, although it is drought-tolerant once established. The plant is relatively low-maintenance, although it may need pruning after flowering to maintain its shape. Several cultivars of California lilac are available in nurseries, including 'Ray Hartman,' 'Trewithen Blue,' and 'Blue Ray.' These cultivars offer a range of flower colors, from deep blue to light pink. Ceanothus arboreus is an excellent choice for coastal gardens, as it tolerates salt spray well. It attracts beneficial insects, such as bees, butterflies, and hummingbirds, and provides habitat for birds with its dense foliage. Overall, Ceanothus arboreus is a beautiful evergreen shrub or tree with fragrant flowers that add color and interest to any garden setting. It also offers ecological benefits, supporting wildlife habitats in the coastal regions of California and Oregon where it naturally occurs.

Characteristics

Plant Type

Tree, Shrub

Life Cycle

Perennial

Genus

Ceanothus

Family

Rhamnaceae

Hardiness Zone

8-10

Mature Height

3.66 m to 10.97 m

Mature Spread

7.92 m

Leaf Color

Green

Leaf Type

Evergreen

Flower Color

Blue, Purple

Flower Size

5.08 cm to 7.62 cm

Bloom Time

Spring

Planting Time

Spring, Winter

Harvest Time

Summer

Tags (7)

Common Names (6)