Modern viticultural industry is still in its infancy in Virginia. Extensive research is underway to match varietal, clonal and vine training systems to Virginia's various terroirs. Chardonnay is the most produced grape, more than doubling its rival, Cabernet Sauvignon. Viognier and Cabernet Franc are two vitus vinifera varietals which are also planted. French-American hybrids and native vines also thrive, forming nearly 20% of production.