wow!ive never tried root cuttings in water.ill have to give it a try! ive done stem cuttings get a young shoot, cut just below a node snip the leaves off the bottom half about 3 leaf nodes. put the bottom half in a pot of moist potting mix. cover with a jar & set in a bright place out of direct sun. in about a month they should root. {some people like to use a root hormone powder when stem cutting.ive never tried the powder but i here it works good} o yea this works best if you take the cutting in
spring before bloom or after bloom! good luck!