Hello Mad the way i did mine was to seperate the clump with a fork then i tidyed up the messy bits ,and replanted.i hope this makes sense. :o))

I often snap stems off and I usually push the stem a good 3" into good compost and keep it well watered. So if you cut the straggly stems and do the same then they should be ok.

Yes, just cut these thick horizontal stems into sections and plant them just below the surface. They will all grow by sending new side shoots out from this stem section. I have done this myself many times in the past.

Thanks a lot everyone, thats really useful.