Troubleshooting
Trewithen Blue Ceanothus problems — and how to fix them
Trewithen Blue Ceanothus (Ceanothus arboreus 'Trewithen Blue') is generally forgiving once you match its basics, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Root rot from overwatering
The most common cause of death; ensure perfect drainage and do not water established plants in autumn or winter.
Winter frost damage
Not fully hardy; a sheltered wall and fleece protection during severe frosts are essential outside mild coastal areas.
Phytophthora
Sudden collapse in wet soils; remove affected plants and do not replant ceanothus in the same spot.
Scale insects
Waxy bumps on stems; treat with horticultural oil in late winter or early spring.
Short lifespan
Many ceanothus are relatively short-lived (10-15 years); take cuttings regularly to maintain a replacement plant.
Prevent trewithen blue ceanothus problems before they start
Most trewithen blue ceanothus issues are care-mismatch, not bad luck. Dial in the basics:
Trewithen Blue Ceanothus problems — FAQ
Why is my trewithen blue ceanothus root rot from overwatering?
The most common cause of death; ensure perfect drainage and do not water established plants in autumn or winter.
Why is my trewithen blue ceanothus winter frost damage?
Not fully hardy; a sheltered wall and fleece protection during severe frosts are essential outside mild coastal areas.
Why is my trewithen blue ceanothus phytophthora?
Sudden collapse in wet soils; remove affected plants and do not replant ceanothus in the same spot.
Why is my trewithen blue ceanothus scale insects?
Waxy bumps on stems; treat with horticultural oil in late winter or early spring.
Why is my trewithen blue ceanothus short lifespan?
Many ceanothus are relatively short-lived (10-15 years); take cuttings regularly to maintain a replacement plant.