I think it's the magnesium, but I honestly don't know. I don't care so much to be honest because It seems to work on my three stubborn phals that just don't want to bloom. I've used the Epsom solution on them twice last year and again this past winter...all three times I had spikes within a few weeks. Coincidence?...possibly. Either way, I'm happy because they finally bloom regularly as long as I drench them in the solution. I figure it's not hurting them and I always flush them with plain water the next few waterings to flush out the salt.
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