I once heard some one say they used the Miracle-Gro orchid potting mix for their gerber daisies by accident, and they looked amazing, but didn't use it for their orchids.
Also, when I was looking for fertilizer for my orchids, I came across the MG one, but the nitrogen in it came from urea, which I've read is not recommended. It's my understanding that while some orchids (phals, if I'm correct) can use nitrogen derived from urea, it takes too long for the urea to break down into a form the orchids can use - by the time the urea has broken down into that form, it has already been washed down the drain three waterings ago.
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