Grafting is the most reliable means of propagating the desired cultivar. Grafting joins together a piece of a mature, bearing tree (scion) with a separate seedling tree (rootstock) to form a permanent union. The scion forms the canopy of the tree and the rootstock the lower trunk and roots.
It takes 50 days for the graft to be a harvest. This video shows the grafting experiment by attaching three young roots to attach and air layering. The result is pretty good and gets a really big jackfruit tree.

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