I appreciate the input because I've wondered about the validity of this and how you'd really repot to keep the "pot-bound" element but leave enough room for new growth too.

I've got a Wilsonara Islers Farbspiel which in the growth instructions said it prefers to be potbound for best bloom. Gobs of new roots are coming up out of the top of the pot and the half of the mature pbs are all hanging over the edges and now it has 3 new growths also. I've been trying to find any pot that would both keep the roots somewhat tight and also have room that the new growths would be able to mature without being smunched against the edge of the pot as they became pb's. The mature pb's are really quite large so I was wondering how in the world to effectively do this. Three days of doing this... when I test out sizing of a large variety of pots. No more , just going to give it some room to grow.

RSJ