Colombard, by contrast, has almost 25,000 acres and king Chardonnay has about 95,000 acres). I generally only ask that a wine meet one of my three criteria for a Fringe Wine and this one hits two (unusual location and unusual style), so here we go.
Grenache Blanc is thought to be native to eastern Spain and it is still grown in Rioja, where it is allowed in the Rioja blend, but is seldom used due to its tendency to oxidize (the Spanish love long barrel aging for their Rioja wines which is an invitation to oxidation for grapes that are especially prone to it). It is related to Grenache Noir (aka Garnacha Tinta or just plain Grenache, usually), in the same way that Pinot Noir is related to Pinot Blanc and Pinot Gris (as a skin-color mutation of a clone). Southern France is where most Grenache Blanc is grown today, with significant plantings in the Rhone Valley (especially Châteauneuf-du-Pape and Languedoc-Rousillon). It is also grown in southeastern Spain along the Pyrenees. Tablas Creek is the winery in the US that is responsible for the cultivation of Grenache Blanc as Grenache Blanc here. They took cuttings from Chateau Beaucastel in Châteauneuf-du-Pape and planted then in 1996 with the first harvest happening in 1999. From 1999 through 2002, they were only allowed to label their wines as "Grenache," since Grenache Blanc was not yet recognized by the Bureau of Alcohol, Tobacco and Firearms as a legitimate varietal. They petitioned in 2002 and won approval in 2003 to label wines made from this grape as Grenache Blanc. The first varietally labeled wines were released in 2004.