Azolla filiculoides - Lam.
Common Name Azolla, Pacific mosquitofern
Family Azollaceae
USDA hardiness Coming soon
Known Hazards None known
Habitats Stagnant and slow moving waters[270].
Range Western N. America
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Fully Hardy Water Plants Semi-shade Full sun

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Azolla filiculoides Azolla, Pacific mosquitofern
Azolla filiculoides Azolla, Pacific mosquitofern
Physical Characteristics
 icon of manicon of flower
Azolla filiculoides is a PERENNIAL growing to 0.1 m (0ft 4in) at a fast rate.
It is hardy to zone (UK) 7 and is not frost tender. The flowers are hermaphrodite (have both male and female organs)It can fix Nitrogen.
Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: acid, neutral and basic (alkaline) soils. It can grow in semi-shade (light woodland) or no shade. It can grow in water.


Edible Uses
None known
Medicinal Uses
Plants For A Future can not take any responsibility for any adverse effects from the use of plants. Always seek advice from a professional before using a plant medicinally.

None known


Other Uses
Green manure;  Soil conditioner.

The plant is an exceedingly good source of nitrogen-rich biomass that can be used as a fertilizer or can be added to the compost heap[200, 270].
Cultivation details
Requires a sunny or lightly shaded position in still or slowly flowing water. Plants are not very cold tolerant, surviving overwintering in colder winter areas by means of submerged resting buds[200]. Plants seldom reproduce by spores[200]. This species has a symbiotic relationship with an algae which fixes atmospheric nitrogen[200].
Seed -
Other Names
Found In
Weed Potential

Right plant wrong place. We are currently updating this section. Please note that a plant may be invasive in one area but may not in your area so it’s worth checking.

Conservation Status
IUCN Red List of Threatened Plants Status :
Related Plants
Latin NameCommon NameEdibility RatingMedicinal Rating
Azolla pinnataWater Fern, Ferny or Red Azolla00


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Botanical References
Links / References
For a list of references used on this page please go here
Readers comment
planmetabolome   Sun Oct 7 2007 medicinal plant database

Dominic   Fri Jan 16 2009
Azolla is a fern and should have spore-producing organs rather than flowers. .
Factsheet on Azolla   Mar 11 2013 12:00AM
Azolla is an invasive non-native species in Britain, so we should either not use it at all, or use it with extreme caution. See for example link below.
GB non-native species secretariat
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Subject : Azolla filiculoides  

Plant Uses

Edible Uses
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