I grew some diospyros texana, don’t know if that’s helpful or not. I wanted some as tubbed specimens in zone 6a, the seeds sprouted like garden beans with heat. Grew nicely, looked great until their roots touched bottom of pots, then died. My source by Rio Grande river said most of her desert seeds (diospyros texana, prunus texana, etc.) were like that, needed to have unrestricted root growth. Hope you have good luck.