This has nothing (well almost nothing) to do with fertilizer. If you provide good growing conditions the mycorrhizal fungi that may live in association with your orchids will thrive. As to whether " Plant Success Fantastic Fungi mycorrhiza" has any benefit, who knows! Sounds like a great idea, add some beneficial fungi and your orchids will thrive.

Oh...I was under the impression that it was some sort of fertilizer (or something to that affect), because the descriptions I've read talk about how they aid the plant in growing (supposedly). I probably misunderstood it. Anywho, thanks for the reply :)