FLASH SALES: 20% off selected plants!
Share your pictures? Hide split images
I have read and agree the terms and conditions of service.

Ceanothus Trewithen Blue - California Lilac

Ceanothus arboreus Trewithen Blue
California Lilac

12 reviews
4,8/5
11 reviews
0 reviews
0 reviews
1 reviews
0 reviews

Beautiful specimen received, thank you very much!!! It has the perfect shape to become a tree in the future, it looks very healthy and with flower buds, very satisfied with the specimen and the great price. Promesse de Fleurs never disappoints me. Thank you from Spain.

Beatriz, 11/03/2024

Leave a review → View all reviews →

Why not try an alternative variety in stock?

  1. Ceanothus prostratus
    Ceanothus prostratus
    Available to order
    From €10.50 2L/3L pot

    Available in 2 sizes

  2. Ceanothus thyrsiflorus repens - Californian Lilac
    Ceanothus thyrsiflorus repens - Californian …
    53
    From €3.70 8/9 cm pot

    Available in 3 sizes

  3. Ceanothus arboreus Concha
    Ceanothus arboreus Concha
    31
    From €16.50 2L/3L pot

  4. Ceanothus Skylark
    Ceanothus Skylark
    32
    From €12.50 2L/3L pot

    Available in 2 sizes

  5. Ceanothus delilianus Gloire de Versailles
    Ceanothus delilianus Gloire de Versailles
    10
    From €12.50 3L/4L pot

    Available in 3 sizes

  6. Ceanothus delilianus Henri Desfossé
    Ceanothus delilianus Henri Desfossé
    2
    From €16.50 2L/3L pot

  7. Ceanothus foliosus Italian Skies
    Ceanothus foliosus Italian Skies
    7
    From €3.70 8/9 cm pot

    Available in 3 sizes

  8. Ceanothus thyrsiflorus El Dorado
    Ceanothus thyrsiflorus El Dorado
    24
    From €16.50 2L/3L pot

  9. Ceanothus pallidus Marie Blue
    Ceanothus pallidus Marie Blue
    15
    From €14.90 3L/4L pot

    Available in 2 sizes

  10. Ceanothus impressus Cool Blue
    Ceanothus impressus Cool Blue
    Out of stock
    From €10.50 1.5L/2L pot

    Available in 2 sizes

  11. Ceanothus Blue Mound
    Ceanothus Blue Mound
    11
    From €10.50 2L/3L pot

    Available in 2 sizes

View all →

Select delivery date,

and select date in basket

This plant carries a 24 months recovery warranty

More information

Value-for-money
A large, spreading, evergreen shrub noted for its abundant clusters of fragrant, deep blue flowers in late spring and early summer. 
Flower size
6 cm
Height at maturity
4 m
Spread at maturity
3 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -6°C
Soil moisture
Dry soil
plantfit-full

Does this plant fit my garden?

Set up your Plantfit profile →

Best planting time March to April
Recommended planting time March to May, September to October
J
F
M
A
M
J
J
A
S
O
N
D
Flowering time May to July
J
F
M
A
M
J
J
A
S
O
N
D

Description

Ceanothus arboreus 'Trewithen Blue' is a large bush with intense blue flowering. This variety is interesting for its large size and upright habit that allows for beautiful isolated uses. Its flowers are nectar-producing. The decorative flowering lasts a long time. Numerous flowers appear between April and June in a deep blue colour. They are grouped in paniculate clusters that are 6 cm to 8 cm (2.4 in to 3.1 in) long.

Ceanothus foliage is evergreen and green in colour. The leaves are alternate, elliptical, and finely dentate. Its average lifespan is 15 to 20 years and its ideal climate is rather maritime. It tolerates sea spray well.

Native to California, the eastern United States, and Mexico, it has good hardiness that goes down to -10° C (14° F), provided it is planted in well-drained soil. It requires a lot of space in the garden. It can be placed in isolation, in a bed, as a free hedge, as well as by the seaside.

Plant habit

Height at maturity 4 m
Spread at maturity 3 m
Habit Irregular, bushy
Growth rate normal

Flowering

Flower colour blue
Flowering time May to July
Flower size 6 cm
Fragrance slightly scented

Foliage

Foliage persistence Evergreen
Foliage colour dark green

Botanical data

Genus

Ceanothus

Species

arboreus

Cultivar

Trewithen Blue

Family

Rhamnaceae

Other common names

California Lilac

Origin

Cultivar or hybrid

Other Ceanothus

  1. Ceanothus impressus Victoria
    Ceanothus impressus Victoria
    Available to order
    From €10.50 2L/3L pot

  2. Ceanothus Skylark
    Ceanothus Skylark
    32
    From €12.50 2L/3L pot

    Available in 2 sizes

  3. Ceanothus thyrsiflorus repens - Californian Lilac
    Ceanothus thyrsiflorus repens - Californian …
    53
    From €3.70 8/9 cm pot

    Available in 3 sizes

  4. Ceanothus thyrsiflorus Millerton Point
    Ceanothus thyrsiflorus Millerton Point
    50
    From €16.50 2L/3L pot

  5. Ceanothus Blue Diamond
    Ceanothus Blue Diamond
    Out of stock
    From €11.90 2L/3L pot

  6. Ceanothus foliosus Italian Skies
    Ceanothus foliosus Italian Skies
    7
    From €3.70 8/9 cm pot

    Available in 3 sizes

  7. Ceanothus Burkwoodii
    Ceanothus Burkwoodii
    Out of stock
    From €12.50 2L/3L pot

  8. Ceanothus arboreus Concha
    Ceanothus arboreus Concha
    31
    From €16.50 2L/3L pot

  9. Ceanothus Blue Mound
    Ceanothus Blue Mound
    11
    From €10.50 2L/3L pot

    Available in 2 sizes

  10. Ceanothus delilianus Gloire de Versailles
    Ceanothus delilianus Gloire de Versailles
    10
    From €12.50 3L/4L pot

    Available in 3 sizes

  11. Ceanothus delilianus Henri Desfossé
    Ceanothus delilianus Henri Desfossé
    2
    From €16.50 2L/3L pot

Planting and care

Place Ceanothus in a sunny or partially shaded position. Plant in ordinary soil that should be moist but well-drained. Beware of cold drafts that the bush does not like. It can be placed close to a wall. Plant it all year round, except during frost, by mixing your garden soil with compost. Water generously once or twice a week to promote establishment. It is a very easy plant to grow. Moisture in the soil during the winter period is harmful to the plant. That is why, in affected soils, it is better to plant Ceanothus on a mound.

Planting period

Best planting time March to April
Recommended planting time March to May, September to October

Intended location

Suitable for Meadow, Rockery
Type of use Border, Free-standing, Hedge, Climbing
Hardiness Hardy down to -6°C (USDA zone 9a) Show map
Ease of cultivation Amateur
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Acidic, Neutral, Any
Soil type Stony (poor and well-drained)
Soil moisture Dry soil, Well-drained soil

Care

Pruning instructions This bush does not require pruning, however, you can trim the plant after the flowering to maintain a compact shape and refresh it by removing dead wood.
Pruning Pruning recommended once a year
Pruning time July to August
Soil moisture Dry soil
Overwinter Can be left in the ground
4,8/5
11 reviews
No reviews
No reviews
1 reviews
No reviews

Evergreen shrubs

  1. Camellia transnokoensis Sweet Jane
    Camellia transnokoensis Sweet Jane
    7
    From €39.50 4L/5L pot

  2. Cordyline australis Mint Chocolate - Cabbage Tree
    Cordyline australis Mint Chocolate - Cabbage…
    Out of stock
    From €29.50 7.5L/10L pot

  3. Pittosporum tenuifolium Tom Thumb - Kohuhu
    Pittosporum tenuifolium Tom Thumb - Kohuhu
    27
    €27.50 2L/3L pot

    Available in 2 sizes

  4. Melaleuca gibbosa
    Melaleuca gibbosa
    2
    From €16.50 2L/3L pot

  5. Erica carnea Winterfreude - Winter Heath
    Erica carnea Winterfreude - Winter Heath
    7
    From €5.90 1L/1.5L pot

  6. Dicksonia antarctica - Tree Fern
    Dicksonia antarctica - Tree Fern
    17
    €13.90 2L/3L pot

    Available in 4 sizes

  7. Azalea japonica Ho Oden
    Azalea japonica Ho Oden
    Available to order
    -20% €11.92 €14.90 2L/3L pot

  8. Eucalyptus mitchelliana
    Eucalyptus mitchelliana
    8
    €41.50 4L/5L pot

  9. Prunus laurocerasus Genolia - Cherry Laurel
    Prunus laurocerasus Genolia - Cherry Laurel
    11
    From €20.50 3L/4L pot

  10. Rhododendron simsii Sachsenstern - Knaphill Azalea
    Rhododendron simsii Sachsenstern - Knaphill …
    Out of stock
    From €14.90 3L/4L pot

  11. Chamaecyparis lawsoniana Elwoodii - Lawson Cypress
    Chamaecyparis lawsoniana Elwoodii - Lawson C…
    15
    From €14.90 2L/3L pot

    Available in 3 sizes

  12. Quercus myrsinifolia
    Quercus myrsinifolia
    11
    €32.50 3L/4L pot

    Available in 2 sizes

  14. Ilex aquifolium Alaska - Common Holly
    Ilex aquifolium Alaska - Common Holly
    Out of stock
    From €18.50 2L/3L pot

  15. Eucalyptus citriodora
    Eucalyptus citriodora
    142
    -50% €1.95 €3.90 Plug plant 1.5/2.5 cm

    Available in 4 sizes

  16. Ilex crenata Fastigiata - Japanese Holly
    Ilex crenata Fastigiata - Japanese Holly
    7
    From €39.50 3L/4L pot

  18. Cryptomeria japonica Araucarioides
    Cryptomeria japonica Araucarioides
    8
    €49.00 4L/5L pot

  19. Abies koreana Molli - Korean Fir
    Abies koreana Molli - Korean Fir
    3
    €49.00 3L/4L pot

  20. Rhododendron edgeworthii
    Rhododendron edgeworthii
    3
    From €24.50 3L/4L pot

Haven't found what you were looking for?

Let's find plants fitting with your garden!