For the most part, the powdered rooting hormones are too concentrated for use on the root zone of orchids. Instead, a liquid version, properly diluted, is the way to go - KelpMax, K-L-N, and SuperThrive come to mind immediately.
If the plant is not potted, I'd immerse the whole plant in a tepid solution of one of them (KelpMax @ 1 Tbsp/gal, the others at 1 tsp/gal) for 30 minutes, then pot it up. If already potted, then pour it on an soak the medium. If your product is fresh (less of a concern with KelpMax), then one application might be plenty. Repeating it in 2-3 weeks is fine, but more frequent addition is simply a waste of product.
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