The Temperate Database is in the process of being updated, with new records being added and old ones being checked and brought up to date where necessary. This record has not yet been checked and updated.
Common Name: Star Duckweed
Lemna trisulca is a perennial plant that can grow up to 0.01 metres tall.
It is harvested from the wild for local use as a medicine..
Europe, including Britain, from Scandanavia south and east to N. Africa, Asia, N. America, Australia
Ponds and ditches in all parts of Britain except north Devon and east Cornwall[
]. Mesotrophic, quiet waters rich in calcium, in cool-temperate regions[
Requires a sunny position in still water that is rich in nitrates and lime[
Duckweed can be a troublesome pond weed though it is easily controlled by simply scooping it out[
]. This scooped out material makes an excellent addition to the compost heap. The growing plant is a good food source for fish and birds, as well as providing cover for creatures in the pond[
This species is very suitable for use in cold water aquaria though, like all members of the genus, it can harbour fish parasites[
The plant 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[
A poultice of the wetted plant, combined with another plant, has been used in the treatment of swellings[
Seed - we have no information on this species but, since it spreads so rapidly by division, it really needs no extra help once it is in a pond.