The 13 acres of Zinfandel on Rhinefarm were planted in 1976 and grow in the upper benchland portion of the vineyard at an average elevation of 200 feet. They thrive in the rocky, well-drained conditions presented by the alluvial fan compris-ing the lower Mayacamas Mountain Range. Topsoils are 18 to 34 inches deep, consisting of Rhyolitic volcanic ash and alluvial wash. Beneath the topsoil is a mostly impervious layer of consolidated volcanic ash with occasional fractures for the roots to penetrate to deeper depths, producing wines with concentrated fruit flavors and firm structural qualities. Pervasive maritime breez-es and long daylight exposure allow fruit to develop intense concentration while retaining vibrant structure. The vineyard typically yields 2.5 tons/acre.