Ceanothus arboreus 'Trewithen Blue'
Californian lilac 'Trewithen Blue'
A large vigorous evergreen spreading shrub to 6m in height, with broadly oval or rounded leaves to 8cm in length, and slightly fragrant deep blue flowers in panicles to 12cm in length
Ultimate height4–8 metres
Time to ultimate height10–20 years
Ultimate spread4–8 metres
MoistureMoist but well–drained, Well–drained
Colour & scent
- Full sun
West–facing or South–facing or East–facing
- Native to the UK
Ceanothus can be evergreen or deciduous shrubs or small trees, with simple leaves and small blue, pink or white flowers in profuse axillary or terminal clusters. They are fast-growing but may be short-lived
- Name status
How to grow
Grow in well-drained soil in a sheltered position in full sun
Propagate by semi-hardwood cuttings
Suggested planting locations and garden types
- City and courtyard gardens
- Wall side borders
Can get scale insects
The Royal Horticultural Society is the UK’s leading gardening charity. We aim to enrich everyone’s life through plants, and make the UK a greener and more beautiful place.