Bill Swindell, THE PRESS DEMOCRAT
California’s drought has become an integral part of the conversation around Wine Country. Nothing is immune from discussion, from how many toilet flushes are acceptable to the types of gardens and lawns that are best suited in an era with less available water.
As the area’s largest and most valuable crop, North Coast grape growers have been a popular point of focus as well as contention. In fact, an ongoing debate over the centuries-old practice of dry farming highlights the increasing pressure the industry faces as the state grapples with a new water reality that Gov. Jerry Brown said will take “unprecedented actions” to solve.
For some, the practice of dry farming — where natural rainfall, not irrigation, is used exclusively to produce a crop — is rooted in history. Yet, it is relevant to modern times as Napa wines that won the historic 1976 Paris tastings were all dry farmed.
Proponents of dry farming note that drip irrigation can overly protect the vine from stress needed to produce top-quality wines, delay the development of full flavors until later in the growing season and result in wines with higher alcohol content.
“A bigger question is why people irrigate?” said John Williams, the owner of Frog’s Leap Winery in Napa, which has been dry farming its eight vineyards since opening 35 years ago.
For others, however, the practice is ideal, but not feasible to be widespread throughout the area’s diverse landscape, especially in areas where the soil is sandy and vineyard roots are not deep, such as hillsides. Not all soil is similar to that of Napa Valley, where Williams estimates about 20 percent of the vineyards dry farm.
“Shallow soil does not hold sufficient moisture to grow a vine,” said Rhonda Smith, the viticulture farm advisor for the UC Cooperative Extension in Sonoma County.
Additionally, research has shown that dry farming can reduce a crop yield significantly, bringing serious economic consequences.