I'm experimenting with this too, Mike King told me how to do it last year at his open day but unfortunately between then and now ive totally forgot =/ however i have just cut the stem off and just inserted it into the pot, i haven't buried it or anything just left the top part sticking out of the soil, not sure if i was supposed to use rooting powder or anything though, so i guess ill just have to wait and see if it works =P