The message
from "Charlie Pridham" contains these words:

They are very easy to propagate from short internodal cuttings (set of buds
at top but not at bottom) layering and root division, indeed after you have
had one a couple of years preventing it spreading is likely to be a higher
priority than propagating it!

Too right Charlie, weeding is the problem not propagating!

Reminds me must get out and stop mine taking over the gutter.
Jennifer