Troubleshooting
Hydrocharis morsus-ranae problems — and how to fix them
Hydrocharis morsus-ranae (Hydrocharis morsus-ranae) 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.
Invasive spread
It is a regulated invasive in parts of the US and Canada; sale or release may be prohibited. Keep it in a contained pond and bin surplus rather than dumping it.
Overcrowding the surface
It multiplies quickly and can blanket a small pond, shading submerged plants and lowering oxygen; scoop out excess regularly.
Disappearing in autumn
Leaves rot and the plant overwinters as sunken turions; this is normal dormancy, not death, and it reappears in spring.
Aphid clusters
Aphids gather on the small leaves; hose them into the water for fish or net the affected rosettes rather than spraying.
Prevent hydrocharis morsus-ranae problems before they start
Most hydrocharis morsus-ranae issues are care-mismatch, not bad luck. Dial in the basics:
Looking for hydrocharis morsus-ranae in general rather than its problems? Read the full hydrocharis morsus-ranae care guide — light, water, soil and feeding.
Hydrocharis morsus-ranae problems — FAQ
Why is my hydrocharis morsus-ranae invasive spread?
It is a regulated invasive in parts of the US and Canada; sale or release may be prohibited. Keep it in a contained pond and bin surplus rather than dumping it.
Why is my hydrocharis morsus-ranae overcrowding the surface?
It multiplies quickly and can blanket a small pond, shading submerged plants and lowering oxygen; scoop out excess regularly.
Why is my hydrocharis morsus-ranae disappearing in autumn?
Leaves rot and the plant overwinters as sunken turions; this is normal dormancy, not death, and it reappears in spring.
Why is my hydrocharis morsus-ranae aphid clusters?
Aphids gather on the small leaves; hose them into the water for fish or net the affected rosettes rather than spraying.