| I don't think it is a good idea to use vinegar in any dilution on orchids. It is an acid (acetic acid) and vinegar has roughly about 5 %.
Besides the smell it may increase the acidity (pH) of the medium and from what I have read here on the forum threads , some orchids DO NOT like acidity.
I know it is an excellent and harmless cleansing agent besides being a preservative. It should stay that way I think.
Unless some other experienced member says otherwise do not use it on orchids.
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