Troubleshooting
Mock Orange problems — and how to fix them
Mock Orange (Philadelphus coronarius) 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.
Few flowers after wrong-time pruning
It blooms on last year's wood; pruning in winter or spring removes the flower buds. Prune immediately after flowering instead.
Leggy, bare base
Old shrubs become congested and bare-legged; renovate by cutting a third of the oldest stems to the ground each year after flowering.
Powdery mildew
A white coating on leaves in dry, crowded conditions; improve airflow by thinning stems and avoid drought stress.
Aphids on new shoots
Spring aphids cluster on soft growth and excrete honeydew; usually controlled by natural predators without intervention.
Prevent mock orange problems before they start
Most mock orange issues are care-mismatch, not bad luck. Dial in the basics:
Looking for mock orange in general rather than its problems? Read the full mock orange care guide — light, water, soil and feeding.
Mock Orange problems — FAQ
Why is my mock orange few flowers after wrong-time pruning?
It blooms on last year's wood; pruning in winter or spring removes the flower buds. Prune immediately after flowering instead.
Why is my mock orange leggy, bare base?
Old shrubs become congested and bare-legged; renovate by cutting a third of the oldest stems to the ground each year after flowering.
Why is my mock orange powdery mildew?
A white coating on leaves in dry, crowded conditions; improve airflow by thinning stems and avoid drought stress.
Why is my mock orange aphids on new shoots?
Spring aphids cluster on soft growth and excrete honeydew; usually controlled by natural predators without intervention.