Troubleshooting
Pillwort problems — and how to fix them
Pillwort (Pilularia globulifera) 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.
Smothering by algae and blanketweed
In nutrient-rich or eutrophic water, fast-growing algae and filamentous blanketweed rapidly smother the delicate fronds; maintain nutrient-poor, lime-free water conditions and remove competing growth by hand promptly.
Loss due to constant water levels
Pillwort declines in ponds with stable, permanently high water levels; it requires seasonal drawdown to exposed mud in summer to regenerate and produce spores — without this fluctuation, more vigorous aquatic plants outcompete it.
Prevent pillwort problems before they start
Most pillwort issues are care-mismatch, not bad luck. Dial in the basics:
Pillwort problems — FAQ
Why is my pillwort smothering by algae and blanketweed?
In nutrient-rich or eutrophic water, fast-growing algae and filamentous blanketweed rapidly smother the delicate fronds; maintain nutrient-poor, lime-free water conditions and remove competing growth by hand promptly.
Why is my pillwort loss due to constant water levels?
Pillwort declines in ponds with stable, permanently high water levels; it requires seasonal drawdown to exposed mud in summer to regenerate and produce spores — without this fluctuation, more vigorous aquatic plants outcompete it.