Story: Water quality

Hornwort

Hornwort

New Zealand’s worst water weed, hornwort (Ceratophyllum demersum), can smother other weeds and completely cover the surface of streams.

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Greater Wellington Regional Council

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How to cite this page:

Mike Scarsbrook and Kit Rutherford, 'Water quality - Problem plants and microbes', Te Ara - the Encyclopedia of New Zealand, http://www.TeAra.govt.nz/en/photograph/15527/hornwort (accessed 19 May 2022)

Story by Mike Scarsbrook and Kit Rutherford, published 24 Nov 2008, updated 18 Jul 2016