Meristematic or bud clusters of Syngonium, Spathiphyllum, potato and banana were multiplied on interfacial membrane rafts and in plastic film air lift bioreactors. The clusters were separated by a mechanical cutting device and subcultured either to multiplication or to a growth medium on an interfacial membrane raft. For Syngonium, the clusters were multiplied in bioreactors equipped with a filter device to control contamination during proliferation. For Syngonium, Spathiphyllum and banana, plantlets were regenerated either on agar or on membrane rafts. For potato, microtubers were produced in tuber induction medium. Details on the rates of multiplication and growth will be presented for the various crops.