Tony

Fanis,

I think it will depend on the rock you intend to use whether it will work with this tree or not. A small flatish rock might work. Keep in mind that you need the roots long enough so they can drape over the rock and reach several inches into the soil below. I've done a couple of ROR styles. I grew the roots out in a deep pot before hand to make sure they were long enough. They need to be young flexible roots too so they can be formed to the contours of the rock. Just thought I would mention this. I didn't want you to get started with your repot and THEN realize that the roots are too short.

As for what to wrap the rock with to hold the roots in place. You can use raffia but it's a pain to work with. I've found some material that is used to line shelves and cupboards. It's kind of a rubbery, elastic material, I guess so it stays put and doesn't slide around on the shelf. I got a roll of that about 12" wide and cut it into thin strips 1/2" wide and wraped the rock with that. Because it's elastic it's much easier to work with and holds things in place better. There's probably many things that would work, use your imagination.

Tony