@fruitnut tbud tutorial was excellent T-budding tutorial but there is a slightly different method you might be interested in thats used for nut trees https://www.youtube.com/watch?v=8CaXkms7rB8 but it would work very well for fruit trees. With difficult grafts such as walnuts, pecan etc. there are many ways to hedge your bets https://www.youtube.com/watch?v=QcU5RTC4ZPM. Grapes are no different if traditional methods don’t work other methods will. You might also be interested in approach grafting Approach Grafting and Inarching. Here is a little more on vegetable grafting http://hos.ufl.edu/sites/default/files/faculty/gdliu/VegetableGraftingUF2-25-2015Compressed.pdf
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