This is one of the few grafts that I am actually tempted by. I don't have a cold problem, but I have a water and pest problem. Passiflora laurifolia/Water Lemon does better in climates like mine, which can have a rough dry season. It also grows faster than some other varieties here. If I get a sturdy vine now that I have planted seeds, I would consider grafting other types onto it.
Once I have more mature plants, and perhaps run out of space, grafting may become more of a priority for me to learn. But for now, the idea of grafting a vine sounds cool, especially since I need an abundance of passionflowers and other vines to cover all my fencing, which is seemingly endless. I was very disappointed to lose several fairly developed passiflora vines, and in an instant all my privacy and yard appeal. Would be great not to have to worry about that next time.