Can one effectively prune phoenix roots and what is the best strategy for doing that?  I have a number of phoenix in large pots (e.g., 25G plus) and unlike most other families, phoenix will grow roots so aggressively that they will lift the entire palm, root base, soil and all right out of the pot such that it's no longer aesthetic.  I'm attaching two photos below that show this.  I think it was in a David Lesser book that I saw a photo at Versailles with many dozens of date palms in pots, i.e.,