I find the best way to get results is to layer a suitable shoot ie. lay
a strong growing low shoot along the ground and make a slit in the
shoot, being careful not to cut right through, then bury the shoot
about two inches deep.

Leave the shoot undisturbed until late autumn by which time you should
have seen it growing on. Carefully lift the cutting and you should see
that it has rooted. Cut it free from the main plant and pot up, leaving
the pot in a shelterd spot until spring.

Spenny