Troubleshooting
Allium 'Hair' problems — and how to fix them
Allium 'Hair' (Allium vineale 'Hair') 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.
Bulb rot
Waterlogged or heavy soil causes soft, mushy bulbs. Plant in sharply drained ground or raised beds and avoid summer irrigation during dormancy.
Flopping stems
Too little sun or excess nitrogen produces weak scapes that lean. Site in full sun and avoid rich feeding.
Self-seeding spread
As a vineale cultivar it can naturalise vigorously; deadhead before seed sets if you want to limit colonies.
Onion downy mildew
Damp, crowded conditions invite pale leaf patches and grey mould. Space bulbs and ensure airflow; remove affected foliage.
Prevent allium 'hair' problems before they start
Most allium 'hair' issues are care-mismatch, not bad luck. Dial in the basics:
Looking for allium 'hair' in general rather than its problems? Read the full allium 'hair' care guide — light, water, soil and feeding.
Allium 'Hair' problems — FAQ
Why is my allium 'hair' bulb rot?
Waterlogged or heavy soil causes soft, mushy bulbs. Plant in sharply drained ground or raised beds and avoid summer irrigation during dormancy.
Why is my allium 'hair' flopping stems?
Too little sun or excess nitrogen produces weak scapes that lean. Site in full sun and avoid rich feeding.
Why is my allium 'hair' self-seeding spread?
As a vineale cultivar it can naturalise vigorously; deadhead before seed sets if you want to limit colonies.
Why is my allium 'hair' onion downy mildew?
Damp, crowded conditions invite pale leaf patches and grey mould. Space bulbs and ensure airflow; remove affected foliage.