Troubleshooting
Farrer's Gentian problems — and how to fix them
Farrer's Gentian (Gentiana farreri) is generally low-drama, but a few issues come up again and again. Here is what each one looks like, why it happens, and the fix.
Failure to flower (lime intolerance)
Plants growing in alkaline or calcium-rich soil develop yellowing leaves and refuse to flower; test soil pH before planting and acidify with sulphur chips or use a dedicated ericaceous growing medium.
Slug damage
Young shoots in spring are highly attractive to slugs; use wool pellets or nematode-based controls (Phasmarhabditis hermaphrodita) — avoid metaldehyde slug pellets, now banned in the UK.
Prevent farrer's gentian problems before they start
Most farrer's gentian issues are care-mismatch, not bad luck. Dial in the basics:
Farrer's Gentian problems — FAQ
Why is my farrer's gentian failure to flower (lime intolerance)?
Plants growing in alkaline or calcium-rich soil develop yellowing leaves and refuse to flower; test soil pH before planting and acidify with sulphur chips or use a dedicated ericaceous growing medium.
Why is my farrer's gentian slug damage?
Young shoots in spring are highly attractive to slugs; use wool pellets or nematode-based controls (Phasmarhabditis hermaphrodita) — avoid metaldehyde slug pellets, now banned in the UK.