Before revision: Natural grafting upA "husband and wife tree" – natural grafting in blackthornPrunus spinosa Tree branches and more often roots of the same species will sometimes naturally graft; this is called inosculation.
After revision: Natural grafting upA "husband and wife tree" blackthorn, (Prunus spinosa), the result of natural grafting Tree branches and more often roots of the same species will sometimes naturally graft; this is called inosculation.