There are other reasons for grafting, besides creating "rainbow trees ", such as when you're trying to save cuttings that are far too short too root easily...(1-2 inch tips), or when trying to create a cross -species tree (smile) say, a standard tree with a P.rubra trunk, and P. stenopetala branches, with a pendulous, "weeping " growth habit, or when attempting to shorten a plumeria plant that's grown too tallish. ("Down -grafting ") There are other reasons, too
Not a stupid question at all..
And Tarev, I agree. Dappled shade or an easrern exposure for rooting plumies, or for those that haven't grown enough leaves to protect their trunks from sunburn or sun damage. I agree with your other observations, as well, at least when growing plumeria here!
