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Life in Freshwater

Water Fern Azolla

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Water Fern

 

Fronds are approximately 1 cm across but as budding occurs so the frond increases in size, often dying back at the base. Early in the year they are reddish in colour but by mid-summer they are all green

The Water Fern was introduced from North America and has now become naturalised throughout the warmer waters of Western Europe . It can sometimes be seen in very high densities covering the surface of small ponds, turning red in the autumn.

When found in high densities the Water Fern can be a serious pest, reducing the light available to indigenous aquatic plants growing beneath the surface. It competes favourably with the Duckweed which may become significantly reduced.



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