Troubleshooting
Marie Simon Ceanothus problems — and how to fix them
Marie Simon Ceanothus (Ceanothus × pallidus 'Marie Simon') 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 in wet soils
Even this more adaptable hybrid needs well-drained soil; improve heavy clay with grit and organic matter at planting.
Powdery mildew
Can affect deciduous foliage in warm, dry summers; improve airflow and water at the base.
Aphids
May cluster on soft new shoots in spring; dislodge with a water jet or treat with insecticidal soap.
Frost die-back
Deciduous habit makes it hardier than evergreen forms, but severe frosts may still kill soft tips; cut back to healthy wood in spring.
Sparse flowering in shade
Move to a sunnier position; the summer-flowering habit requires maximum sunlight to flower well.
Prevent marie simon ceanothus problems before they start
Most marie simon ceanothus issues are care-mismatch, not bad luck. Dial in the basics:
Marie Simon Ceanothus problems — FAQ
Why is my marie simon ceanothus root rot in wet soils?
Even this more adaptable hybrid needs well-drained soil; improve heavy clay with grit and organic matter at planting.
Why is my marie simon ceanothus powdery mildew?
Can affect deciduous foliage in warm, dry summers; improve airflow and water at the base.
Why is my marie simon ceanothus aphids?
May cluster on soft new shoots in spring; dislodge with a water jet or treat with insecticidal soap.
Why is my marie simon ceanothus frost die-back?
Deciduous habit makes it hardier than evergreen forms, but severe frosts may still kill soft tips; cut back to healthy wood in spring.
Why is my marie simon ceanothus sparse flowering in shade?
Move to a sunnier position; the summer-flowering habit requires maximum sunlight to flower well.