Troubleshooting
Bog Arum problems — and how to fix them
Bog Arum (Calla palustris) 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.
Slug damage to leaves
Slugs graze on the large, soft leaves, leaving ragged holes. Use wildlife-safe iron phosphate pellets around pond edges; avoid metaldehyde products near water.
Rhizome rot in stagnant warm water
In hot summers with little water movement, rhizomes can soften and rot. Improve circulation with a small pump and remove any decaying material promptly.
Invasive spread in mild climates
In USDA zones above 6, rhizomes can spread aggressively. Contain by planting in mesh baskets sunk into the pond; divide every 2–3 years to control spread.
Prevent bog arum problems before they start
Most bog arum issues are care-mismatch, not bad luck. Dial in the basics:
Bog Arum problems — FAQ
Why is my bog arum slug damage to leaves?
Slugs graze on the large, soft leaves, leaving ragged holes. Use wildlife-safe iron phosphate pellets around pond edges; avoid metaldehyde products near water.
Why is my bog arum rhizome rot in stagnant warm water?
In hot summers with little water movement, rhizomes can soften and rot. Improve circulation with a small pump and remove any decaying material promptly.
Why is my bog arum invasive spread in mild climates?
In USDA zones above 6, rhizomes can spread aggressively. Contain by planting in mesh baskets sunk into the pond; divide every 2–3 years to control spread.