We live on a 0.29 acre lot in the southern part of the Central Valley in California. Citrus trees grow very well here, and the original owners of this land planted an orange tree (Valencia, I think), and a grapefruit tree (a sweet ruby red variety). Although the trees are not placed where I would want them to be all the way at the back of a lot that is much longer than it is wide, I want to keep them. The main problem is that I can't even give away as much grapefruit as this tree produces. While I like the grapefruit from this tree, I really prefer pomelos to grapefruit. I know that grapefruit is a hybrid between pomelo and orange, so I'm wondering if a pomelo graft would take on a grapefruit tree. Does anyone know if I can graft pomelo onto grapefruit, and if I can, what would be the best way to go about it? When it comes to trees, I know very basic stuff, like fruit trees need excessive pruning, and it looks more natural if you avoid topping trees. I have never grafted a tree before, so I have no idea how to make it work. I also have not the slightest clue if grafting a pomelo onto a grapefruit would work in terms of actually producing both fruit types. I've been told there's no such thing as a lemon/lime tree because the tree will revert to one type of fruit, either lemon or lime, so I'm wondering if the same would be true of a pomelo grafted onto a grapefruit. Thoughts anyone?