Troubleshooting
Blue Star Water Lily problems — and how to fix them
Blue Star Water Lily (Nymphaea nouchali var. caerulea) 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.
Aphids and water lily aphids
Water lily aphid (Rhopalosiphum nymphaeae) clusters on pads and flower buds; knock off with a strong water jet directed into the pond rather than using insecticides that harm fish.
Pond snails and leaf damage
Ramshorn and pond snails rasp holes in floating pads; hand-pick at night or introduce biological controls such as assassin snails in ornamental ponds without fish.
Prevent blue star water lily problems before they start
Most blue star water lily issues are care-mismatch, not bad luck. Dial in the basics:
- Common blue star water lily problems — our other guide for the same plant
- What's wrong with my plant? — the diagnosis apps compared
- Blue Star Water Lily watering schedule
- Blue Star Water Lily light requirements
- Best soil mix for blue star water lily
- Blue Star Water Lily temperature & humidity
- Full blue star water lily care guide
Looking for blue star water lily in general rather than its problems? Read the full blue star water lily care guide — light, water, soil and feeding.
Blue Star Water Lily problems — FAQ
Why is my blue star water lily aphids and water lily aphids?
Water lily aphid (Rhopalosiphum nymphaeae) clusters on pads and flower buds; knock off with a strong water jet directed into the pond rather than using insecticides that harm fish.
Why is my blue star water lily pond snails and leaf damage?
Ramshorn and pond snails rasp holes in floating pads; hand-pick at night or introduce biological controls such as assassin snails in ornamental ponds without fish.