When first tested, the results indicated the soil had excellent levels of nutrients for vineyard growth. the potassium, magnesium and calcium were also superbly in balance. So in 1997, we planted 110R rootstock and later budded 337 clone. Treva's vineyard is a steep, rocky stie with red volcanic soils and excellent drainage. The southeastern exposure provides full sun without intense heat. It produces a small yield of tiny dark blue to black berries maturing near the end of September.