Grafting may well increase crop yield just because it increases vigour, and reduces disease & stress vectors, for the plant. I didn't intend to suggest graftin

Grafting may well increase crop yield just because it increases vigour, and reduces disease & stress vectors, for the plant. I didn't intend to suggest grafting is bad -- it's clearly a great thing to do. All ~25 of my heirloom apple, peach, and pear varieties are grafted. And yes, I doubt you can find fruit trees in a nursery that aren't grafted. I was suggesting that multi-grafted trees are more bother than multiple single-grafted trees.