My 36" grafted Cac Hoa Loc from Toptrop had some fruits the first time. They all fiberous and not good taste. However its two scions were grafted on a 10ft Kent seedling gave excellent fruits, just 20ft from the mother tree. So it's worthwhile to wait for a grown up tree with more roots and more leaves to get more elements for a more better fruits. I hope this applies to other kind of mangoes too.