"What exactly is an Heirloom Navel? They look just like other Navel Orange, but these are actually Navel Oranges picked from “old line” orange groves in the San Joaquin Valley – usually Washington variety Navels grown with the similar culture (plant and tree care, and harvesting techniques) used 100 years ago. In fact, many of the trees are a century old. The rootstock, soil and growing methods create a fabulous eating experience that might make you say, “Oh, that was a really good orange! Sweet!”"