Troubleshooting
Hooker's Inula problems — and how to fix them
Hooker's Inula (Inula hookeri) 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.
Invasive spreading by rhizomes
Inula hookeri spreads enthusiastically by underground rhizomes and can overwhelm smaller plants. Plant in a large metal or plastic rhizome barrier sunk 30-40cm deep, or site in a large border where spread can be managed by periodic division.
Mildew on foliage in dry spells
Powdery mildew appears on foliage when soil dries out in late summer. Consistent watering and good airflow through the clump reduce incidence. Remove affected leaves and avoid overhead watering.
Aphid colonies on flower buds
Aphids commonly colonise the flower stem tips and buds. Blast off with water or treat with insecticidal soap. The plant's spreading habit means a few aphids pose little long-term threat.
Prevent hooker's inula problems before they start
Most hooker's inula issues are care-mismatch, not bad luck. Dial in the basics:
Hooker's Inula problems — FAQ
Why is my hooker's inula invasive spreading by rhizomes?
Inula hookeri spreads enthusiastically by underground rhizomes and can overwhelm smaller plants. Plant in a large metal or plastic rhizome barrier sunk 30-40cm deep, or site in a large border where spread can be managed by periodic division.
Why is my hooker's inula mildew on foliage in dry spells?
Powdery mildew appears on foliage when soil dries out in late summer. Consistent watering and good airflow through the clump reduce incidence. Remove affected leaves and avoid overhead watering.
Why is my hooker's inula aphid colonies on flower buds?
Aphids commonly colonise the flower stem tips and buds. Blast off with water or treat with insecticidal soap. The plant's spreading habit means a few aphids pose little long-term threat.