Troubleshooting
Wolffia arrhiza problems — and how to fix them
Wolffia arrhiza (Wolffia arrhiza) 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.
Impossible to eradicate
Its dust-fine fronds escape nets and recolonise from a single plant; once unwanted it is extremely hard to remove, so introduce it deliberately and contained.
Surface film and light blocking
A thick meal blocks light and gas exchange below; skim regularly and keep part of the surface open to protect submerged plants and fish.
Sinks in moving water
Any surface current drives the tiny fronds under where they perish; baffle filter outflows to keep the surface dead calm.
Clogs filters and pumps
The fine grains are drawn into intakes; fit a fine pre-filter sponge over inlets to prevent blockage.
Prevent wolffia arrhiza problems before they start
Most wolffia arrhiza issues are care-mismatch, not bad luck. Dial in the basics:
Looking for wolffia arrhiza in general rather than its problems? Read the full wolffia arrhiza care guide — light, water, soil and feeding.
Wolffia arrhiza problems — FAQ
Why is my wolffia arrhiza impossible to eradicate?
Its dust-fine fronds escape nets and recolonise from a single plant; once unwanted it is extremely hard to remove, so introduce it deliberately and contained.
Why is my wolffia arrhiza surface film and light blocking?
A thick meal blocks light and gas exchange below; skim regularly and keep part of the surface open to protect submerged plants and fish.
Why is my wolffia arrhiza sinks in moving water?
Any surface current drives the tiny fronds under where they perish; baffle filter outflows to keep the surface dead calm.
Why is my wolffia arrhiza clogs filters and pumps?
The fine grains are drawn into intakes; fit a fine pre-filter sponge over inlets to prevent blockage.