Troubleshooting
Million Bells 'Superbells' problems — and how to fix them
Million Bells 'Superbells' (Calibrachoa 'Superbells') 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.
Iron-deficiency chlorosis
Yellowing between leaf veins, especially on new growth, from alkaline soil or water; correct with an acidifying or iron-rich fertiliser and avoid hard tap water.
Root rot from overwatering
The most common killer — soggy mix causes wilting, browning, and collapse. Use fast-draining soil and let the surface dry between waterings.
Leggy, bare-centred plants
Too little light or no mid-season feeding leads to long, sparse stems; a light trim and renewed feeding rejuvenate the mound.
Botrytis / grey mould
Damp, crowded foliage develops fuzzy grey rot on flowers and stems; improve airflow and remove affected growth.
Prevent million bells 'superbells' problems before they start
Most million bells 'superbells' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for million bells 'superbells' in general rather than its problems? Read the full million bells 'superbells' care guide — light, water, soil and feeding.
Million Bells 'Superbells' problems — FAQ
Why is my million bells 'superbells' iron-deficiency chlorosis?
Yellowing between leaf veins, especially on new growth, from alkaline soil or water; correct with an acidifying or iron-rich fertiliser and avoid hard tap water.
Why is my million bells 'superbells' root rot from overwatering?
The most common killer — soggy mix causes wilting, browning, and collapse. Use fast-draining soil and let the surface dry between waterings.
Why is my million bells 'superbells' leggy, bare-centred plants?
Too little light or no mid-season feeding leads to long, sparse stems; a light trim and renewed feeding rejuvenate the mound.
Why is my million bells 'superbells' botrytis / grey mould?
Damp, crowded foliage develops fuzzy grey rot on flowers and stems; improve airflow and remove affected growth.