Ceanothus Trewithen Blue 3 Litre Pot

Ceanothus ‘Trewithen Blue’ – Magnificent California Lilac with Rich Blue Flowers

Ceanothus ‘Trewithen Blue’ is one of the finest evergreen California Lilacs, renowned for its spectacular display of rich cobalt-blue flowers and handsome glossy foliage. In late spring, the shrub becomes smothered in dense clusters of intensely coloured blooms, creating one of the most breathtaking floral displays in the garden.

The masses of fragrant blue flowers contrast beautifully with the large, glossy dark green leaves, giving the shrub outstanding ornamental value throughout the year. The blooms are rich in nectar and attract bees, butterflies, and other pollinating insects, making it an excellent addition to wildlife-friendly gardens.

With its vigorous, arching habit, ‘Trewithen Blue’ is perfect as a specimen shrub, informal screen, or trained against a sunny wall or fence. It also performs exceptionally well in coastal gardens, where it tolerates salt-laden winds and exposed conditions.

Thriving in full sun, this evergreen shrub prefers fertile, well-drained soil and benefits from a warm, sheltered position. Once established, it is drought tolerant and requires very little maintenance beyond light pruning immediately after flowering to maintain its shape.

Its combination of evergreen foliage, spectacular flowers, and low-maintenance nature makes it one of the most rewarding spring-flowering shrubs for UK gardens.

Elegant, colourful, and full of wildlife value, Ceanothus ‘Trewithen Blue’ is an outstanding choice for adding vibrant spring colour and year-round structure.

Seasonal Beauty & Growth

Spring

Masses of rich cobalt-blue flowers cover the shrub.

Summer

Glossy evergreen foliage provides structure and colour.

Autumn

Dense green foliage remains fresh and attractive.

Winter

Evergreen leaves continue to provide year-round interest and shelter.

Why Grow Ceanothus 'Trewithen Blue'?

✔ Spectacular cobalt-blue spring flowers
✔ Attractive glossy evergreen foliage
✔ Excellent for bees and pollinators
✔ Perfect for coastal gardens
✔ Drought tolerant once established
✔ Low maintenance and easy to grow

Perfect For

• Mixed shrub borders
• Coastal gardens
• Sunny walls and fences
• Wildlife-friendly planting
• Feature shrubs
• Mediterranean-style gardens

Planting & Care Guide

Position: Full sun in a sheltered location.

Soil: Fertile, well-drained soil.

Hardiness: Hardy in most UK gardens; protect from cold drying winds in exposed locations.

Watering: Water during establishment; drought tolerant once established.

Pruning: Lightly trim immediately after flowering to maintain shape. Avoid cutting into old wood.

Ultimate Size: Approximately 2–3m tall and 3–4m wide.

Looks Great With

• Lavender
• Cistus
• Pittosporum tenuifolium
• Phormium tenax
• Hebe varieties
• Rosemary

Ceanothus ‘Trewithen Blue’ is one of the most spectacular evergreen shrubs for spring, combining a breathtaking display of deep blue flowers with glossy evergreen foliage to provide lasting beauty and valuable pollinator interest in UK gardens.