I carefully dug up the plant to see if perhaps the roots had been severed or damaged by crane fly larvae (they're a problem here) but the roots are firmly attached and have good color. The part of the rhizome below the media surface is dark brown and a bit soft. I repotted this plant about 3 months ago and don't recall any issues with color or texture at that time. The above-ground growth is green/white and healthy, if slow, but Dana's tend to put on their best growth in late summer so I'm not too concerned.
That said, is any softness in a Sarr rhizome a cause for alarm?
Are some rhizomes "firmer" than others?
The plant gets 8 hours of direct sun each day, sits in a tray with 2-3 inches of zero water. No top watering.
I didn't see any evidence of pest damage to the roots, but I could run a mosquito bits drench to be safe.
All advice appreciated!