Thanks, Anna! It is a group-generated article that benefited so many of us who have potted plants with this kind of root system (and acorns have been shared around accordingly). I join in acknowledgment of the sources of knowledge and guidance that made it possible, and add my applause:
tink3472
fiwit
dormantsrule
And, for anyone looking for more updates and follow-ups (on the outcome of the trimming and re-potting over time, for additional ideas, etc.) the Daylily Forum thread can be found at:
The thread "Q & A: How to Trim Potted DL Roots?" in
Daylilies forum