Trev,
Many graft techniques will work with persimmon - first ones I ever did were just a simple whip/splice graft (no ‘tongue’). I’ve just been doing a simple bark graft for most of the last 20 years, with good success.
Don’t get in a hurry to do them - they need some heat to callus… so, they’re one of the last things I graft in spring. Aftercare is probably more important than technique - you’ll need to check them at least twice a week to keep rootstock shoots below the graft rubbed off. Persimmon is VERY persistent about trying to push its own shoots, and given half a chance, it’ll rapidly outgrow the scion.
Those well-established seedlings/root suckers will probably push some really vigorous growth… better plan on driving a stake or taping one to the trunk that you can tie the new growth off to so that wind or bird-perching won’t blow/knock the graft off.
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