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Wolffia arrhiza - (L.)Horkel. ex Wimm.
                 
Common Name Least Duckweed, Spotless watermeal
Family Lemnaceae
USDA hardiness 6-9
Known Hazards None known
Habitats Floating on quiet waters[204]. A rare native of southern Britain, growing in still waters[17].
Range Europe, including Britain, to Asia.
Edibility Rating  
Other Uses  
Weed Potential No
Medicinal Rating  
Care
Fully Hardy Water Plants Full sun

Summary

Wolffia arrhiza Least Duckweed, Spotless watermeal


commons.wikimedia.org/wiki/User:Fice
Wolffia arrhiza Least Duckweed, Spotless watermeal
commons.wikimedia.org/wiki/File:Illustration_Wolffia_arrhiza0.jpg
   
Physical Characteristics
 
Wolffia arrhiza is an evergreen Perennial.
It is hardy to zone (UK) 7. It is in leaf 12-Jan It is in flower from Jan to December, and the seeds ripen from Jan to December. The flowers are hermaphrodite (have both male and female organs)Suitable for: light (sandy), medium (loamy) and heavy (clay) soils. Suitable pH: neutral and basic (alkaline) soils and can grow in very alkaline soils.
It cannot grow in the shade. It can grow in water.

Synonyms

Habitats
 Pond;
Edible Uses
Edible Parts: Leaves.
Edible Uses:

Leaves - cooked. An excellent flavour, they taste somewhat like a sweet cabbage[183]. The leaves are very nutritious, containing about 20% protein, 44% carbohydrate. 5% fat and are rich in vitamins A, B2, B6, C and nicotinic acid[183].
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
None known
Cultivation details
A pond plant, floating on the surface of the water, it requires a sunny position in still water that is rich in nitrates and lime[200]. At the limit of its climatic range in Britain and probably best grown in a cold water aquarium[200]. It over-winters in temperate areas by means of resting buds which sink to the bottom of the pond in the late autumn and rise again in the spring[200]. One of the smallest flowering plants in the world, it is cultivated as a vegetable in Burma, Laos and Thailand[183]. It has been recommended for commercial cultivation, especially in tropical areas, because of its rapid multiplication and high nutritional value[183]. Plant densities of over two million plants per square metre have been found[274].
Propagation
Seed - we have no information on this species but, since it can spread rapidly by division, it really needs no extra help once it is in a pond.

Books by Plants For A Future

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 :
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Expert comment
 
Author
(L.)Horkel. ex Wimm.
Botanical References
17200204
Links / References
For a list of references used on this page please go here
Readers comment
 
Elizabeth H.
Louis Landesman Tue Oct 25 2005

Dr. Wastewater Duckweed Utilization Page Uses of duckweed

Elizabeth H.
Louis Landesman Tue Oct 25 2005

Dr. Wastewater Duckweed Utilization Page Uses of duckweed

Elizabeth H.
nat Mon Jun 29 2009
Would anyone be able to tell me where I could obtain this plant in the UK. Thank you for your help.
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Subject : Wolffia arrhiza  

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