Physan is easy to get hold of. A small amount goes a long way. Clip off all
dead roots; soak 10 min; repot in fresh mix with physan treated pot and
you're on your way. I've had rhyzomes without a single root, begin growing
within a couple of weeks. I've had physan take care of erwinia brown rot
too. I'm not a dealer and don't even own stock in it, but I like the way it
takes care of business.
Gary
PS. GreenShield or other generic algaecide (as in pool treatment) seem to
work as well.

"bb" wrote in message
...
I recently inherited a number of neglected orchids. From what I
understand, root rot is common for orchids that have not been
repotted in a long time, or over watered.

I gather that healthy orchids roots tend to be greenish in color.
Most of these orchids have a decent size root ball but it ranges from
and obvious rotten mass, to a white mass of roots that is brown on the
inside. It would appear what is happening with these orchids is they
are putting out new root spikes that do fine until they reach the old
root mass, then they also rot at that point.

What would be the best method of repotting in this situation? It
would seem that clipping off all the dead and rotting roots up to the
green part would make the most sense. If I do this I end up with a
lot of stubby roots ranging up to about 1" long. Like I said, once
the roots hit the old root ball they rot, so the only decently long
roots are the one's growing outside the pots.

Also, I've heard mention of using cinnamon to inhibit root rot. Would
using a disinfectant specifically for orchids help in killing off the
root rot?

From what I'm beginning to see, I should 've given away everything
except the Vandas.

Thanks for any helpful hints. I didn't plan on getting into orchids
just yet, but just like stray animals, I can't pass up a living
creature in need.

bb