Here are some pictures to give you an idea how I go about repotting native plants for bonsai.
The first is a ti tree. These came from seed collected at Smoky Cape, NSW. The parent trees were dwarfed plants growing in cracks in bare rock so I figured they should be adaptable enough to make good bonsai. They have turned out to be happy to shoot from older wood when pruned and I have had no problems when pruning the roots. The only drawback is they are slightly frost sensitive down here but they have always sprouted again in spring. No flowers yet. Sorry about the focus on that one. Someone had adjusted the camera to manual focus

Native week has actually turned out to be native fortnight. Today I did a few more and whenever I have another look I find a few more that need a repot.
I nearly missed this Melaleuca which was hiding among the others that are getting close to getting their own bonsai pots.
Melaleuca in a 30cm orchid pot. I needed a saw to cut through the roots on this one. A few larger roots have been cut This is probably not the ideal pot for this tree but is the best I could do today.