PlumpJack Group has acquired Steltzner Vineyards to add to its growing portfolio of vineyards in Oakville and Howell Mountain. The 40-acre property is located in the Stags Leap District in Napa Valley and comprises 36 acres of planted vineyards. The varietals include Cabernet Sauvignon, Merlot, Malbec, Cabernet Franc, Tintoria and Pinotage.