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soak seed for 24 hrs with clean water changes every 8 hours. Seeds will float if dry but after soaking should sink. A quick dip in a fungicide wouldn't hurt either before planting. Plant in sterile growing medium. a commercial seed starting mix with peat in perlite works fine.
Follow-up. The one seedling that sprouted dampened off and died. Still no other seeds have sprouted. This is strange as I have planted many Annonas before and usually get high rates of germination. I have many 1-2 year old seedlings ready to be grafted onto. I hope I can get a scion from you Luke when they become available.