Ive heard that grafting a citrus variety can affect the flavor. Does that mean that if I graft an orange onto a grapefruit rootstock, the oranges will acquire a grapefruit flavor?
No, each variety will always have the same basic flavor, regardless of rootstock. But the rootstock chosen will affect the intensity of the flavor, as well as the sweetness-to-sourness ratio. Generally, less vigorous rootstocks (Poncirus trifoliata, Sour orange, citrumelo) stocks give a richer-flavored fruit. Very vigorous stocks (rough lemon, volkameriana, Rangpur) give a more bland, diluted-tasting fruit. In the questioners example, grapefruit roots will cause the orange scion to produce bland-flavored fruit.
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