Propagating money trees

you state you can propagate money trees by planting a leaf. could you possibly give more details on this process? how moist must the soil be? how deep do you stick the leaf in the soil? do you use a single leaf, or do you stick a complete stem with several leaves on them? your help would be greatly appreciated. thank You, Owen Lawson

the term money tree applys to a number of different plants in different countries. could you possibly give a common botanical name or species/genus if known.