Hi fellows
I know that a few tried it with some success
I tried 30 grafts in the early summer var. Mauritius on a side branch of a 30 years old longan and it is now 30 cms long shoot.
I heard that a nursery here used to graft lychees on longans and lychee seedlings with 70% success but prefers rooting lychee cuttings in a hot humid tiny tummels in late spring.
I will appreciates the experimenters with lychee grafting on longans to tell more about the present situation of their experimantations