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Ceanothus arboreus 'Trewithen Blue' (Feltleaf ceanothus 'Trewithen Blue')

Other names: Felt-leaf ceanothus 'Trewithen Blue', Californian lilac 'Trewithen Blue', Catalina ceanothus 'Trewithen Blue', Island ceanothus 'Trewithen Blue', Island mountain lilac 'Trewithen Blue', Catalina mountain lilac 'Trewithen Blue'

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Variety or Cultivar
'Trewithen Blue' is a large, vigorous, spreading, evergreen shrub or small tree with broadly ovate, glossy, dark green leaves, felted beneath, and conical panicles of lightly fragrant, deep blue flowers in spring.
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Season of interest

Flower

Spring Summer Autumn Winter
Flower

Foliage

Spring Summer Autumn Winter
Foliage
Height and spread

Height and spread

Size Max height Max spread To maturity
6 m 8 m 10-20 years
19 ft 26 ft 10-20 years

Where to grow

Soil type
  • Chalky
  • Loamy
  • Sandy
Soil drainage
  • Moist but well-drained
  • Well-drained
Soil pH
  • Alkaline
  • Neutral
Sunlight
  • Full Sun
Aspect
  • East
  • West
  • South
Exposure
  • Sheltered

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Additional plant details

Cultivation

Plant in well-drained soil in a sheltered position in full sun.

Suggested uses

City, Wallside and trellises

UK hardiness

H4

USDA zones

Zone 7, Zone 8, Zone 9, Zone 10

Sunset zone

5, 6, 7, 8, 9, 14, 15, 16, 17, 18, 19, 20, 21, 22, 23, 24

WUCOLS

North-Central Coastal = Low
Central Valley = Low
South Coastal = Low
South Inland = Moderate/Medium
High and Intermediate Desert = Inappropriate
Low Desert = Inappropriate

Foliage

Evergreen

Habit

Spreading, Branching

Native to

Channel Islands (United States)

Drought tolerant

No

Flood tolerant

No

Toxicity

Not toxic

Plant care

Pruning

Propagation methods

Semi-hardwood cuttings

Pests

Scale insects

Diseases

Honey fungus

Prune out unsightly shoots only (only when needed)

Plant container grown plants in deep fertile, well-drained soil

Take semi-hardwood cuttings in late-summer

Plant container grown plants in a sunny sheltered spot

Plant in fertile, humus-rich, well-drained soils

Other plants

Plants in this Genus (70)

Ceanothus

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Ceanothus (any evergreen variety)
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Ceanothus (any evergreen variety) Californian lilac (any evergreen variety)
Ceanothus 'Tuxedo'
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Ceanothus 'Tuxedo' California lilac 'Tuxedo'
Ceanothus 'Blue Sapphire'
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Ceanothus 'Blue Sapphire' California lilac 'Blue Sapphire'
Ceanothus x veitchianus
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Ceanothus x veitchianus Veitch ceanothus
Ceanothus 'Blue Cushion'
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Ceanothus 'Blue Cushion' California lilac 'Blue Cushion'
Ceanothus 'Tilden Park'
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Ceanothus 'Tilden Park' Californian lilac 'Tilden Park'
Ceanothus arboreus 'Trewithen Blue'
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Ceanothus arboreus 'Trewithen Blue' Feltleaf ceanothus 'Trewithen Blue'
Ceanothus 'Autumnal Blue'
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Ceanothus 'Autumnal Blue' Californian lilac 'Autumnal blue'
Ceanothus 'Burkwoodii'
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Ceanothus 'Burkwoodii' Californian lilac 'Burkwoodii'
Ceanothus 'Concha'
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Ceanothus 'Concha' Californian lilac 'Concha'
Ceanothus thyrsiflorus var. repens
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Ceanothus thyrsiflorus var. repens Creeping blue blossom
Ceanothus 'Puget Blue'
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Ceanothus 'Puget Blue' Californian lilac 'Puget Blue'
Ceanothus 'Blue Mound'
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Ceanothus 'Blue Mound' Californian lilac 'Blue Mound'
Ceanothus 'Dark Star'
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Ceanothus 'Dark Star' Californian lilac 'Dark Star'
Ceanothus 'Cascade'
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Ceanothus 'Cascade' Californian lilac 'Cascade'
Ceanothus x delileanus 'Topaze'
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Ceanothus x delileanus 'Topaze' Californian lilac 'Topaze'
Ceanothus 'Blue Jeans'
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Ceanothus 'Blue Jeans' California lilac 'Blue Jeans'
Ceanothus 'Southmead'
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Ceanothus 'Southmead' Californian lilac 'Southmead'
Ceanothus thyrsiflorus 'Millerton Point'
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Ceanothus thyrsiflorus 'Millerton Point' Blueblossom 'Millerton Point'
Ceanothus x pallidus 'Marie Simon'
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Ceanothus x pallidus 'Marie Simon' Pink Californian lilac
Ceanothus 'Eldorado'
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Ceanothus 'Eldorado' Californian lilac 'Eldorado'
Ceanothus 'Zanzibar'
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Ceanothus 'Zanzibar' Californian lilac 'Zanzibar'
Ceanothus griseus var. horizontalis 'Silver Surprise'
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Ceanothus griseus var. horizontalis 'Silver Surprise' Carmel creeper 'Silver Surprise'
Ceanothus 'Centennial'
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Ceanothus 'Centennial' California lilac 'Centennial'
Ceanothus 'Skylark'
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Ceanothus 'Skylark' Californian lilac 'Skylark'
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Companion plants (0)

Related content

Discuss Ceanothus arboreus 'Trewithen Blue' with other Shoot members

Ceanothus 'Arboeus Trewithen'.

Elaine
914 0
My Ceanothus Arboeus Trewithen Is very healthy, although several of the branches are now overhanging the lawn. Can I prune them back quite hard so that I can keep it under control in my small garden. Any suggestions will be appreciated.
Posted: Tuesday 14th of January 2014 06:25 PM Last reply: Friday 28th of February 2025 11:12 AM
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