Why don’t we bare-root or wash the roots of coniferous bonsai during a re-pot? We are told that the tree relies on the beneficial fungi which lives among the roots. Removing too much of this will greatly impair the tree. I’m no expert, so just have a listen to Tom Wessels here. This is an interesting video which sheds some light on the subject and includes some pretty neat footage. Enjoy! The topic of discussion begins at 11:52 in the video.