Azolla - surface plant for aquarium or pond | Aquarium Plants | Fish Tank Plants
 
 
 Azolla is an Australian native fern that is common in many waterways and is commonly used as a decorative feature in garden ponds. It supports a nitrogen-fixing cyanobacterium in its fronds. This nitrogen is released when the plants decay.  It can quickly spread to cover open areas of water and may build up in stationary water bodies, particularly if nutrients levels are adequate.
Azolla is often grown in paddy fields in Asia as a fertiliser.
 

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