Answer: I wonder if the pit is rotting, and something is eating the decaying part? Start with a sterile potting mixture to get the seed growing. You can transplant it to richer soil once it gets started. Use a 4-inch pot, and plant the seed vertically so half of it is exposed above the soil surface. Keep soil moist, but do not waterlog it. Fungus gnats, tiny fly-like insects, infest soil that is perpetually wet, and their larvae feed on tender rootlets. Temperatures should stay around 26C for good germination. Also, there's no need to fertilize it til the seed puts up green shoots. I hope this does the trick!
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