I repotted my greenhouse back in September. This is an annual event unless a
particular plant outgrows it's pot. Most of the plants potted in the fine bark
mixture wether paphs, cattleya seedlings or other types that like smaller media
seem to be doing fine.

Most of the plants potted in medium bark mix are doing terrible. They start new
roots for the most part and they seem to die off when they touch the bark. A
number of plants have not even made any new roots at all. In fact a number of
the mature plant with pseudobulbs have shrunken (this is common when repotting
mature catts but they usually recover).

I treated the bark with a Physan and water mixture by soaking the bark in the
mixture in a twenty gallon container for about twenty minutes. This was to kill
any snow mold spores that might be on the bark, it was Sequoia bark since I
could not get any other since Kensington closed. I have been treating the bark
this way for years without any trouble like this.

Any ideas? Could the bark have been contaminated with an herbicide?