Oxygenating plants help prevent blanket weed growth.
As seen on Love Your Garden with Alan Titchmarsh, June 2012
Algae and Blanket Weed suffocate garden ponds mainly due to their extremely fast growth during the early spring period. Blanket weed can grow up to a foot a day, and with a lack of plant competition for the pond nutrients and light, they quickly take over and pose a risk to fish and other aquatic animals. One of the ways to control these algal blooms is to provide competition for the light and nutrients they need.
Water Lilies provide large areas of shade and prevent the light penetrating the water surface, whilst oxygenating plants such as Elodea Crispa take away the carbon dioxide that the algae need to grow and convert it to oxygen. This, in turn, helps algae-eating animals to thrive, such as water snails, tadpoles and many species of larvae.
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