Once a graft takes, I actually like to get limited pressure on it. I typically use cable ties and tie the growth to the cane very loosely. Persimmon grafts grow so fast because of the large root system, they will flop over. That first year, I use the cane and cable ties to train them vertical until the wood hardens. I like them to be able to move a few inches in any direction with the wind, but no so far as to have a negative impact on the graft.