John, I'm not sure who you asked about grafting at the exchange
, but it's a bark graft
that works best when the sapâ€™s flowing. Bench grafting
is what we do at the exchange, and itâ€™s best done when both the rootstock and scion are dormant.
If you've an established (3 year or older) persimmon tree, it's probably OK to graft it now. But I've heard when the sap begins to flow in some trees, an English walnut for example, it can 'overflow' the graft and 'bleed' so bad the graft will fail. Apples don't do that, but I'm not sure about persimmons? I've bench grafted (dormant) persimmon rootstock; it took them weeks
to show growth, but all three lived (and still do!).
The type of graft you make depends on the size of stock you're working with. If the diameter of the stock (branch or rootstock) nearly matches that of the scion, the whip & tongue
is best. When the stockâ€™s larger, you get into cleft and bark grafting. If you wouldn't be 'sacrificing' a large branch, I'd suggest you graft now... of course your scion wood must be dormant. I think / hope it's not so late that you'll have a problem with excessive sap flow, and I'd hate to discourage you from trying it for fear of that...
Tell us how it goes, but be patient... I was rewarded for mine