The comment about your naval orange tree grafted on citron is because of our cooler winters, the citron root is freeze hardy. The other comment about several types of fruit on one tree is actually different types of citrus trees grafted on one root stock, again because of our freezes here. They are called fruit cocktail trees. Eventually as they age all the fruit will taste the same. Grapefruit usually starts to ripen in late fall and can be picked all through the winter. If it is big and green it is probably a grapefruit. Hope this helps.
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