They're looking great.Ok. I tried to replicate the native soil and climate as best I can remember. I started over with a super light very hydrophobic soil with a good helping of compost from my garden bin. Pinch of Epsom salt, 5.15.5 Water with ph of 5.5 and let them work for it, then a good downpour like it does there, then starve some more. I even made a little red bricks dust for it. Lol
So far so good!
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Thanks to everyone for the input.
The P and Mg are having their effect, and I suspect the compost is pulling up the pH.
The reason I think the 7.0 pH would be best, is that's the pH at which nutrients are most easily absorbed in organic soil.
What I think is going on in the Honduran soil at the low pH, is that the seeds grow into the mycorrhizal fungi of another plant or tree, which shields the roots from the soil's pH.