Troubleshooting
Lesser Spearwort problems — and how to fix them
Lesser Spearwort (Ranunculus flammula) 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.
Stem rot in warm stagnant water
In warm, still pond water during summer, submerged stems can rot and detach. Improve water circulation and remove rotting material. Plant on the very edge of the pond where water movement is greater.
Competition from vigorous marginals
This smaller, more delicate species is easily swamped by vigorous rushes, sedges, or Glyceria. Weed around it in spring and avoid planting alongside very competitive species such as Typha or R. lingua.
Loss during drought or water level drops
Unlike some marginals, Lesser Spearwort does not tolerate dry conditions well. In periods of drought or if pond water levels drop significantly, the shallow-rooted plant can desiccate quickly. Top up water levels during dry spells.
Prevent lesser spearwort problems before they start
Most lesser spearwort issues are care-mismatch, not bad luck. Dial in the basics:
Lesser Spearwort problems — FAQ
Why is my lesser spearwort stem rot in warm stagnant water?
In warm, still pond water during summer, submerged stems can rot and detach. Improve water circulation and remove rotting material. Plant on the very edge of the pond where water movement is greater.
Why is my lesser spearwort competition from vigorous marginals?
This smaller, more delicate species is easily swamped by vigorous rushes, sedges, or Glyceria. Weed around it in spring and avoid planting alongside very competitive species such as Typha or R. lingua.
Why is my lesser spearwort loss during drought or water level drops?
Unlike some marginals, Lesser Spearwort does not tolerate dry conditions well. In periods of drought or if pond water levels drop significantly, the shallow-rooted plant can desiccate quickly. Top up water levels during dry spells.