If those roots are still firm, they might not be dead, just dormant...
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The green tips indicate active growth of the root. And I find anything that shows going forward is good.
I'll defer to others with more experience than I have on that question. But a great question!
If those roots are still firm, they might not be dead, just dormant...
Decent Dendrobium roots!
Freshly watered causing white looking reflections on some leaves.
I couldn't find any bad roots, so here are some very nice roots of Bfrenaria when repotted (November) and new tiny roots already finding their way to the pot two and 1/2 months after (February)...
These are some of my vanda roots...now becoming active again. Sorry about the quality of the photos but it's getting dark outside.
These are some of my dendrobiums and cattleyas
These are some divisions I mounted recently...the first was done last week...see the root tip now attaching to the wood?
Bad Roots on this nodosa l pu purata....can it be saved?
Roots look ok. can certainly nurture it back. I would mount and give it only rain water till puts out new roots.