With any plant, the ideal time for repotting, changing the medium, etc. is just as new roots are forming. With Dens, it often (even usually) happens with new growth. So watch for new growth, then make the switch. It'll probably be on towards spring. The reason for this is that roots tend to adapt to whatever medium they are in, and they may slowly die in a new medium. If you make the transition just as new roots are forming, the old ones will keep the plant going until the new ones grow, but then the new ones will adapt quickly to the new environment and take over.
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