A little white sign lets you know you’ve reached Pennington Farms as do gigantic wood planks announcing berries for sale. Your drive to get to this farm, sort of near Grant’s Pass, Oregon, winds through the Applegate Valley, a bit of heaven lined with hills and meadows and vineyards. Californians (and those who’ve enjoyed some other agricultural fruits of Oregon’s back woods) might wonder if you’ve inadvertently dropped into Mendocino’s wine country. Because much like Mendocino’s famous Apple Farm, you’ve come upon one of those beautifully rustic spots that signal shabby chic rustic beauty as if you’d fallen into a Pottery-Barn-meets-Martha-Stewart type of catalog. Yet what Sam and Cathy Pennington…