Troubleshooting
Showy Cranesbill problems — and how to fix them
Showy Cranesbill (Geranium × magnificum) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Post-flowering dieback
The plant looks tatty and yellowed after the single main flowering flush in early summer; cut all stems back hard to 10 cm to trigger a fresh mound of green foliage for the rest of the season.
Powdery mildew
Common in hot, dry spells; thin congested clumps every three to four years, water at soil level, and divide overcrowded plants to restore vigour and airflow.
Prevent showy cranesbill problems before they start
Most showy cranesbill issues are care-mismatch, not bad luck. Dial in the basics:
Showy Cranesbill problems — FAQ
Why is my showy cranesbill post-flowering dieback?
The plant looks tatty and yellowed after the single main flowering flush in early summer; cut all stems back hard to 10 cm to trigger a fresh mound of green foliage for the rest of the season.
Why is my showy cranesbill powdery mildew?
Common in hot, dry spells; thin congested clumps every three to four years, water at soil level, and divide overcrowded plants to restore vigour and airflow.