Landmark Vineyards may have been founded in the Windsor area of Sonoma County in 1974, but its roots stretch all the way back to 1838. It was in Grand Detour, Illinois of that year that John Deere invented the steel plow – an event that revolutionized the business of agriculture. In 1989, John Deere’s great great granddaughter, Damaris Deere Ford, following the family tradition in agriculture, relocated Landmark Vineyards from Windsor, to a piece of…