Ceanothus Arboreus Trewithen Blue 20 Litre Pot 175/200cm Tall

Ceanothus arboreus ‘Trewithen Blue’ – Bold Blue Blooms with Robust Evergreen Appeal

Ceanothus arboreus ‘Trewithen Blue’ is a striking evergreen shrub renowned for its glossy, leathery dark green leaves and spectacular sprays of deep blue flowers that brighten late spring and early summer. Native to coastal California, this cultivar thrives in mild, sheltered gardens, making it a perfect choice for UK coastal and Mediterranean-style planting schemes.

With a robust, upright growth habit, ‘Trewithen Blue’ can reach a substantial size, creating an impressive architectural feature. Its dense foliage provides year-round structure and acts as a wonderful backdrop for the vivid floral display. The intense blue flower clusters attract pollinators including bees and butterflies, enhancing biodiversity in your garden.

Why Grow Ceanothus arboreus ‘Trewithen Blue’?

• Striking Deep Blue Flowers – Large clusters of vivid blue blossoms add summer brilliance.

• Evergreen, Glossy Foliage – Dense, leathery dark green leaves provide year-round interest.

• Robust Growth – Upright, large shrub suitable for spacious gardens or coastal conditions.

• Drought-Tolerant – Thrives in well-drained soil with minimal water once established.

• Wildlife-Friendly – Flowers attract beneficial pollinators.

Planting & Care Guide

Position: Full sun and sheltered from strong winds. Ideal for south- or west-facing spots.

Soil: Prefers well-drained, moderately fertile soil. Avoid heavy clay and waterlogged areas.

Watering: Water regularly while establishing; drought-tolerant once mature.

Feeding: Feed with a balanced fertiliser in early spring to promote healthy growth and flowering.

Pruning: Light pruning after flowering encourages bushier growth and maintains shape.

Design & Planting Ideas

• Use as a specimen shrub or for hedging in large, sunny gardens.

• Plant near coastal areas or in Mediterranean-style borders for authentic flair.

• Combine with lavender, rosemary, and ornamental grasses for a relaxed, drought-tolerant scheme.

• Add companion plants like salvias and echinacea to attract pollinators.

Ceanothus arboreus ‘Trewithen Blue’ is an excellent choice for gardeners wanting a bold, evergreen shrub that delivers stunning blue flowers with minimal fuss. Its robust habit and coastal tolerance make it perfect for spacious, sunlit gardens seeking Mediterranean elegance and wildlife benefits.