Hi Patti! I really never liked miracle gro potting mix...but if you have no other choice there, maybe add some more perlite or some orchid mix. Orchids have a different requirement fertilizing-wise, and oftentimes miracle gro potting mix already comes with fertilizer.
Please do join us at the Orchids forum. There is a specific thread there for terrestrial orchids
The thread "Terrestrial Orchids, let's discuss!" in
Orchids forum
