Kenneth, Nabor and I walked our Donum and Ferguson Block vineyards today with Dr. Phil Freese, our viticultural consultant. It was cool and overcast until noon. Phil remarked that while it’s been a mild summer, there has been virtually no fog. Cool evenings have kept acid levels up.

Even with clouds overhead today and temperatures barely in the 70s, Phil commented that enough sunlight gets through for photosynthesis (vines won’t grow in full shade). He said photosynthesis will “max out” in the high 70s and low 80s. Even the morning breeze aids the process of ripening by circulating fresh carbon dioxide among the leaves. Phil recalled being in the Nahe Valley in Germany one year for the last 30 days before harvest; even when three out of the four weeks were … More…