Large trifolate orange trees

[SonnyCrockett]

My dad has about 10 fairly large trifolate orange trees at his farm in South Carolina.  They're about 8'-10' tall and their trunks are about 3-4" thick.  What's the best way to graft a different variety to them and when should I do it?

[Bomand]

Gonna be a trick but I have  gotten on the newer branches and top worked different varities via cleft graft to grown poncirus. Be sure you try to get good scions and hou will have better luck. I have a few thorn scars from top working grown poncirus....I will not tell you about the time I fell off a ladder and into the large poncirus I was top working
😁😑

[Oolie]

If you can get the bark to slip, or separate cleanly from the wood, it's a good time.

I like bark grafting for topworking, preference plays a large role here, but I like the large amount of direct cambium contact. I would leave a nice trunk on the tree, but keep the grafts themselves somewhat low, and as close to the center of the tree as possible.