The exterior husk of a walnut in partially removed to show the ripening nut inside on a farm near Roseburg, Ore., on Sunday, Oct. 16, 2011. Walnut trees are native to the mountain ranges of central Asia and were introduced into Western Europe in Roman times or earlier. In North America walnuts are mostly cultivated in California. They also grow very well here is southern Oregon. Check my website to see more of my award winning images.