Duncan Ross, owner and winemaker of Arrowhead Spring Vineyards, pours his new reds. By Bryan Calandrelli, Niagara Region Editor Arrowhead Spring Vineyards billed their last tasting event at the winery as a “Release Event Special.” The tasting, which included five new reds grown in the winery’s own vineyard and one pinot noir sourced from Demaison Vineyard just down the road, wasn’t hyped as their first big estate-grown-red release, but that’s exactly what it was in my view. Since many wineries are still buying grapes outside the county here, any time a winery releases the first wines made from their own…