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Ceanothus arboreus 'Trewithen Blue' (California Lilac)

California Lilac 'Trewithen Blue'


Magnificent, award-winner Ceanothus arboreus 'Trewithen Blue' is a large, spreading, evergreen shrub noted for its abundant clusters, 5 in. long (12 cm), of fragrant, deep blue flowers in late spring and early summer. The flowers are so profuse that they literally cover the bush, creating a breathtaking floral display. The blooms are borne on gracefully arching branches clad with broadly oval, shiny, emerald green leaves. Usually ignored by deer, this pretty shrub is prized by birds, butterflies and hummingbirds. A great addition to the landscape.

  • Recipient of the prestigious Award of Garden Merit of the Royal Horticultural Society.
  • Grows with a bushy habit up to 20 ft. tall (6 m) and 25 ft. wide (8 m).
  • Thrives in average, well-drained soils in full sun. Appreciates afternoon shade in hot summer areas. Provide a sheltered position. Requires little or no water in summer. Drought tolerant.
  • Excellent plant for sunny areas, ideal as a specimen plant, wall-side borders, hedges and screens.
  • Easy to grow, this plant is difficult to transplant once established.
  • Prune after flowering.
  • Propagate by semi-hardwood cuttings
  • Watch for scale insects, honey fungus and Phytophthora root disease.

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Requirements

Hardiness 8 – 10
Climate Zones 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs
Plant Family Ceanothus - California Lilac
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Summer (Early)
Height 15' – 20' (4.5m – 6m)
Spread 20' – 25' (6m – 7.5m)
Water Needs Low
Maintenance Average
Soil Type Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Cut Flowers, Fragrant, Plant of Merit, Showy, Evergreen
Tolerance Deer, Drought, Rabbit, Dry Soil, Rocky Soil
Attracts Birds, Butterflies, Hummingbirds
Garden Uses Beds and Borders, Hedges and Screens, Wall-Side Borders
Garden Styles Informal and Cottage, Mediterranean Garden

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©Clive Nichols

While every effort has been made to describe these plants accurately, please keep in mind that height, bloom time, and color may differ in various climates. The description of these plants has been written based on numerous outside resources.


Requirements

Hardiness 8 – 10
Climate Zones 5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24
Plant Type Shrubs
Plant Family Ceanothus - California Lilac
Exposure Full Sun, Partial Sun
Season of Interest Spring (Late)
Summer (Early)
Height 15' – 20' (4.5m – 6m)
Spread 20' – 25' (6m – 7.5m)
Water Needs Low
Maintenance Average
Soil Type Clay, Loam, Sand
Soil pH Alkaline, Neutral
Soil Drainage Well-Drained
Characteristics Cut Flowers, Fragrant, Plant of Merit, Showy, Evergreen
Tolerance Deer, Drought, Rabbit, Dry Soil, Rocky Soil
Attracts Birds, Butterflies, Hummingbirds
Garden Uses Beds and Borders, Hedges and Screens, Wall-Side Borders
Garden Styles Informal and Cottage, Mediterranean Garden

Great Plant Combination Ideas with Ceanothus - California Lilac

Guides with Ceanothus - California Lilac

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