I think that if you let it go it would be best they will spread on their own , as for splitting I am not sure how it is done I think it has something to do with cutting the stem and attaching and a new one will grow out of the cutting but I am ABSOLUTELY NOT SURE you will need to wait for some one who can tell you how to prop them correctly :mrgreen: I think it is just easier to let them go on their own and safer .
