Troubleshooting
large-flowered butterwort problems — and how to fix them
large-flowered butterwort (Pinguicula grandiflora) 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.
Failure to flower or form hibernacula
This species absolutely requires a cool-cold winter rest (temperatures 2–8°C for 8–12 weeks). Without it, kept warm indoors year-round, plants weaken and cease flowering. Move outdoors or to an unheated greenhouse from October through February.
Root rot in warm conditions
P. grandiflora is intolerant of warm nights above 18°C for extended periods. In warm indoor rooms it declines rapidly. Ensure adequate cooling and airflow; this species is best grown cold and cool, not as a typical tropical houseplant.
Mineral salt build-up
Using tap water gradually deposits calcium and magnesium salts that kill the plant. Always use rainwater or distilled water and flush the pot occasionally with pure water to prevent salt accumulation.
Prevent large-flowered butterwort problems before they start
Most large-flowered butterwort issues are care-mismatch, not bad luck. Dial in the basics:
Looking for large-flowered butterwort in general rather than its problems? Read the full large-flowered butterwort care guide — light, water, soil and feeding.
large-flowered butterwort problems — FAQ
Why is my large-flowered butterwort failure to flower or form hibernacula?
This species absolutely requires a cool-cold winter rest (temperatures 2–8°C for 8–12 weeks). Without it, kept warm indoors year-round, plants weaken and cease flowering. Move outdoors or to an unheated greenhouse from October through February.
Why is my large-flowered butterwort root rot in warm conditions?
P. grandiflora is intolerant of warm nights above 18°C for extended periods. In warm indoor rooms it declines rapidly. Ensure adequate cooling and airflow; this species is best grown cold and cool, not as a typical tropical houseplant.
Why is my large-flowered butterwort mineral salt build-up?
Using tap water gradually deposits calcium and magnesium salts that kill the plant. Always use rainwater or distilled water and flush the pot occasionally with pure water to prevent salt accumulation.