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Common Name: Thrumwort
Damasonium alisma is a Annual/Perennial up to 0.30 metres tall.
It has edible uses.
Central and southern Europe, from Britain and France to Italy and S. Russia, south to N. Africa.
Gravelly ditches and ponds. Very local and apparently decreasing in Britain[
Succeeds in an open sunny position in boggy soils or in still water up to 25cm deep[
]. No further details are given.
Seed - best sown as soon as it is ripe in a cold frame in trays standing in shallow water[
]. When they are large enough to handle, prick the seedlings out into individual pots and grow them on in trays of shallow water, planting them out in the summer.
Division in spring. Very easy, larger clumps can be replanted direct into their permanent positions, though it is best to pot up smaller clumps and grow them on in a cold frame until they are rooting well. Plant them out in the spring.