Yes, all of the above.

Nick

After reading somewhere that trimming the roots results in greater top growth (I think it was Robert Fuchs, but won't swear to it), I lopped all of my vandaceous roots to about 8" (and some were massively long). While I don't think it made the tops bulk up, it certainly didn't hurt the plants or slow them down any. After about a year, they were again trailing on the ground...
When the root tips are broken or damaged, they do tend to branch out into new growths.
Good growing - Nancy

I am keeping an eye on it.
Has been raining a lot here.
Thanks for replies.