If you really want to split vines, The Wine Lover's Companion reports that bottles of Petite Sirah can also be viewed as blends rather than varietals because Petite Sirah grapes are rarely planted alone within a vineyard, but are planted alongside true Syrah, Carignane, Mourvèdre and Grenache. Because of this, many bottles of Petite Sirah are actually accidental blends. Anyway, Petite Sirah was brought back to life thanks to California winemakers, and it's likely to become of the grapes varieties, like Zinfandel, that will be known as a truly Californian variety.
But hold on, I predict, with infinite wisdom, that Petite Verdot will soon surpass Petite Sirah in popularity. Like Petite Sirah, Petite Verdot is a big, silky wine, but its fruit is quite a bit brighter. I'm pretty sure this will make it more accessible to the wine community. Stryker Winery in Alexander Valley, Sonoma County, has produced one of my favorite Petite Verdot varietals. The long growing season of 2006 allowed Petite Verdot grapes to fully ripen, which is the trickiest part of their character, and you can taste it in the glass.
I know, you're probably thinking, How can this varietal, which is practically impossible to find in a normal wine store, become one of the leading wines in America? Just remember I said so. And go get a bottle.