Certified GKH Gardening Expert
I would agree. They can take some time to recover. The miracle grow may have been a little too strong. I tend to recommend dolomitic lime and wettable sulfur instead, though. This will also give calcium to pair with the magnesium, and the wettable sulfur will provide the sulfur. It just covers a little more of the spectrum, and can help condition the soil for long periods of time.