Troubleshooting
Agrimony problems — and how to fix them
Agrimony (Agrimonia eupatoria) 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.
Clinging burr seedheads
Hooked seeds catch on fur and clothing and spread the plant widely; cut back spent spikes before seed sets if you want to limit spread.
Legginess in shade
Stems flop and flower poorly in low light; grow in full sun for sturdy, upright spikes.
Powdery mildew
Dry, crowded plants can develop mildew on the foliage late in the season; thin and water at the base to improve airflow.
Self-seeding
Sets seed freely in suitable sites; deadhead to keep it from naturalising beyond where you want it.
Prevent agrimony problems before they start
Most agrimony issues are care-mismatch, not bad luck. Dial in the basics:
Looking for agrimony in general rather than its problems? Read the full agrimony care guide — light, water, soil and feeding.
Agrimony problems — FAQ
Why is my agrimony clinging burr seedheads?
Hooked seeds catch on fur and clothing and spread the plant widely; cut back spent spikes before seed sets if you want to limit spread.
Why is my agrimony legginess in shade?
Stems flop and flower poorly in low light; grow in full sun for sturdy, upright spikes.
Why is my agrimony powdery mildew?
Dry, crowded plants can develop mildew on the foliage late in the season; thin and water at the base to improve airflow.
Why is my agrimony self-seeding?
Sets seed freely in suitable sites; deadhead to keep it from naturalising beyond where you want it.