This iconic old barn greets visitors to Hermann J. Wiemer's Magdalena Vineyard By Evan Dawson, Finger Lakes Editor In a challenging vintage such as this one, Hermann J. Wiemer has two advantages over many other producers: low yields and a thoughtful picking strategy that brings grapes in on multiple days. First, the picking strategy, which has been carefully developed over many years — first by Hermann and then by current owner and winemaker Fred Merwarth. Instead of picking riesling and gewurztraminer in one sweep, Wiemer brings the grapes in during numerous waves. The last of the three waves of gewurztraminer…