Owned and operated by Alice and John Weygandt, the Vineyard was first planted in 1979; the winery was established in 1996 . The Vineyard comprises 11,000 vines on 15 acres. The Vineyard is located just north of Unionville in Chester County, in southeastern Pennsylvania. It is near the stone referred to as the “Stargazers Stone” which marks the location of the observatory Mason and Dixon used in surveying the border between Pennsylvania and Maryland. They were known as “the stargazers” because they used celestial navigation to correct their measurements over the ground.