I have an amboina lychee that i received from PR as an airlayer many years ago. They are not at all hard to airlayer. But the tree has never flowered or fruited for me after more than a dozen years! Also the tree is extremely slow growing. I have a Sweetheart i planted next to the Amboina, and it is about 5x larger, and it fruits. I only have one Amboina tree, so it could have just turned out to be a runt? From it's growth pattern i suspected for a long time that it is a dwarf tree. I am seriously considering removing this tree!