Before it became home to Magnolias at the Mill, this historic building played a vital role in Purcellville’s agricultural and economic history. Built in 1874, the mill was originally a steam-powered sawmill before transitioning into a seed processing facility that helped establish Purcellville as the orchard grass capital of the United States.

During World War II and the Korean War, orchard grass seed was used as packing material for ammunition, artillery shells, and small arms because of its stability and ability to prevent shifting during transport. The Contee Adams Seed Company, which operated out of this mill for decades, became the largest orchard grass seed processor in Virginia, earning its owner, Contee Lynn Adams Sr., the nickname "Mr. Orchard Grass."

The mill saw multiple transformations and rebuilds over the years due to fires, a common hazard for wooden grain mills. The current structure dates back to 1905, following a devastating fire in 1904. Under the ownership of William Henry Adams and his son, Contee Lynn Adams, the mill focused on processing high-quality orchard grass seed, which was a staple for local dairy and horse farms. The seed industry thrived in Loudoun County, with Virginia farmers producing millions of pounds annually to supply domestic and international markets.

By the late 20th century, with shifting agricultural practices and mechanization, demand for locally processed seed declined. The mill officially ceased operations in 1991, marking the end of an era. However, in the early 2000s, restoration efforts breathed new life into the historic structure, preserving its character while transforming it into a culinary destination.

In 2004, Magnolias at the Mill opened its doors, blending the warmth of history with modern hospitality. Original wooden beams, grain chutes, and historic charm remain intact, offering guests a unique glimpse into the past while they enjoy a thoughtfully crafted meal. Today, Magnolias honors its legacy, not with seed processing, but by curating seasonal, locally sourced ingredients, keeping the spirit of Loudoun’s rich agricultural traditions alive.