Growth ofButomus umbellatus at a stable water level

The paper presents the results of an experiment with the cultivation ofButomus umbellatus at a stable water level of 0.8 m for 6 years. The plant growth, flowering and vegetative reproduction were measured and recorded at the end of each growing season. The species showed a great ability to reproduce vegetatively by rhizome fragments. Cultured plants ofButomus umbellatus did not show any decrease or limitation of growth or flowering caused by stable water level. The expansion of the rhizome system seems to be dependent on its spontaneous fragmentation.