Hi Joshua,
I hope someone with more experience with Vanilla planifolia will chime in, but here's my two cents.
I have seen Vanilla orchids growing in the wild (in a forest on the island of Grenada) and they were growing terrestrially; I would think a medium that's suitable for terrestrial orchids would therefore suit them fine. The mix your orchid is in could be something called Pro-Mix HP, which is sometimes a good medium for terrestrials...I've not used it myself, but i know it does look a lot like potting soil.
Hope that is of some help,
Claire
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