The Navel Orange tree most be reproduced by grafting into trifoliate rootstock, on since the Navel orange is sterile and does not produce seed. A Christmas gift of a box of Navel Oranges ripens just in time for the holidays and is welcome for Christmas festivities. Brazil was the country of origin for the Navel orange, where in a monastery garden a mutation spontaneously occurred on a sweet orange tree that produced an orange(small) within an orange that grows at the interior base of an orange that is sweet, seedless and shaped like a human navel. The Navel Orange is almost seedless and recognized as one of the sweetest oranges ever developed. Everyone loves the plump fruit of this citrus tree. Delicious orange juice squeezed fresh for breakfast from the orange of the Navel Orange tree. Navel Orange Trees produce large yields of delicious orange fruit ready to send to market. The Navel Oranges have no seeds but sweet center sections. The Navel orange is not very cold hardy but grows well in zone 9 on St. Simons Island, Ga. where it is very tolerant to sea spray of the Atlantic ocean sea coast.