Apropos Neohenricia (2 pics)

I was looking for a post to link to Neohenricia sibbettii for my last entry and as I saw an almost a year old picture of my plant I was pretty surprised to see how it has grown. Check this out:

Now
June 2012
I tried to cut one branch off and implant it separately but it didn't take. Even though the parts hanging over the border have some sort of roots they are rather dry and don't soak in water. Anything I should be aware of when making them take root?
Thanks for your comment