By propagated and sharing new strains with others, you help insure their future survival because you are making sure that their continued existence does not depend on a single individual. Please be careful to label your seed-raised plants so that they do not get confused with other strains in your collection. Most Salvia divinorum plants are indistinguishable from eachother, but occasionally a seed-raised plant will be visibly distinctive in some way. Salvia divinorum is a relatively easy plant to propagate from cuttings. Small cuttings will usually root within two or three weeks.
Cuttings seem to root best when they are between two and eight inches long.
They should be cut off of the mother plant using sharp, clean shears. The cut should be made just bellow a node. Leave the glasses indoors in diffuse light and add a little water as necessary to maintain the water level. In about two weeks you should see some roots starting to form. Some cuttings may root more quickly than others.