Troubleshooting
Poison Lagenandra problems — and how to fix them
Poison Lagenandra (Lagenandra toxicaria) 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.
Rhizome rot
Stagnant, poorly oxygenated water or compacted substrate causes rhizome rot. In aquatic setups, ensure gentle water flow; in pots, do not allow water to become anaerobic.
Leaf yellowing
Yellowing of older leaves often indicates either insufficient light or mineral-rich hard water. Switch to rainwater or reverse-osmosis water and move to a brighter but still shaded position.
Slow growth or failure to establish
This is a naturally slow-growing species. Temperatures below 20 °C substantially reduce growth rate. Ensure stable warmth and do not disturb the rhizome unnecessarily during establishment.
Prevent poison lagenandra problems before they start
Most poison lagenandra issues are care-mismatch, not bad luck. Dial in the basics:
Poison Lagenandra problems — FAQ
Why is my poison lagenandra rhizome rot?
Stagnant, poorly oxygenated water or compacted substrate causes rhizome rot. In aquatic setups, ensure gentle water flow; in pots, do not allow water to become anaerobic.
Why is my poison lagenandra leaf yellowing?
Yellowing of older leaves often indicates either insufficient light or mineral-rich hard water. Switch to rainwater or reverse-osmosis water and move to a brighter but still shaded position.
Why is my poison lagenandra slow growth or failure to establish?
This is a naturally slow-growing species. Temperatures below 20 °C substantially reduce growth rate. Ensure stable warmth and do not disturb the rhizome unnecessarily during establishment.