My father's singular obsession with noble limestone permeates every discussion of our wines. He purchased our vineyard land only once he discovered it lies on a 300 foot deep slab of the white, porous rock. Because we are so proud of Limestone’s mineral, high acid effect on the wines, we seldom discuss the thin layer of dirt above.
The Stolpman estate vineyard's clay topsoil is light gray when dry and becomes a sticky mud when wet. Many 2×4 cars have fallen victim to the wet clay, even on our hard-packed roads. Boots become several pounds heavier with mud stuck like bricks in the treads.
That’s the very beauty of clay in our perpetual California drought: it retains moisture. This year, as we look at the driest winter thus far in our vineyard’s history; we are thankful to have clay. As we drip water on the ground through our irrigation hoses, we mimic normal rainfall, allowing the clay to become saturated. Like a year of normal rain fall, when we hope to get 12 inches, we won’t irrigate after set. Set describes the transition when the vines’ tiny flowers become “.” sized grapes.
By cutting water at set, we are ensuring that the plant will still have to fight through the summer to ripen tiny concentrated grapes, undiluted by irrigation. In a drought year like 2014, this is our new definition of dry farming.