Troubleshooting
Geranium x magnificum problems — and how to fix them
Geranium x magnificum (Geranium x magnificum) 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.
Brief bloom period
The main display is one early-summer flush. Shearing the whole plant back hard after flowering ('the Chelsea chop' style cut-back) encourages fresh foliage and sometimes a lighter second flush.
Floppy, open centre
In rich soil or shade, stems splay and the clump opens up. Cut back by half after the first flush and grow in adequate light to keep growth compact.
Powdery mildew
Dense foliage in dry soil can develop white mildew on leaves. Water at the base, space plants for airflow, and cut back affected growth.
Vine weevil grubs
Container or border roots can be eaten by vine weevil larvae, causing wilting. Check roots, and use biological nematode controls in late summer if grubs are found.
Prevent geranium x magnificum problems before they start
Most geranium x magnificum issues are care-mismatch, not bad luck. Dial in the basics:
Looking for geranium x magnificum in general rather than its problems? Read the full geranium x magnificum care guide — light, water, soil and feeding.
Geranium x magnificum problems — FAQ
Why is my geranium x magnificum brief bloom period?
The main display is one early-summer flush. Shearing the whole plant back hard after flowering ('the Chelsea chop' style cut-back) encourages fresh foliage and sometimes a lighter second flush.
Why is my geranium x magnificum floppy, open centre?
In rich soil or shade, stems splay and the clump opens up. Cut back by half after the first flush and grow in adequate light to keep growth compact.
Why is my geranium x magnificum powdery mildew?
Dense foliage in dry soil can develop white mildew on leaves. Water at the base, space plants for airflow, and cut back affected growth.
Why is my geranium x magnificum vine weevil grubs?
Container or border roots can be eaten by vine weevil larvae, causing wilting. Check roots, and use biological nematode controls in late summer if grubs are found.