When Joseph and Marguerite Mannix of Indianapolis purchased two farms in Hamilton County in 1957, they had no idea that their four-year-old son, John Francis, would find his life's work and enjoyment on this property. While growing up on the north side of Indianapolis, John, with his parents and sister, Marilynn, would spend every weekend working on "Jo-Mar Farms."

Later as an adult, John earned his living here working on cars. But it was his personal vegetable garden that was always a source of pleasure and pride. Over the years, he began to cut back on the automotive work and pursue his interest in agriculture by rejuvenating an old orchard on the property. At the same time, he started researching, planning and planting a Christmas tree plantation.

In 1988, he planted a large market garden and his first crop of asparagus. Soon, many people became familiar with Mannix Farms U-Pick Asparagus and John, the asparagus man. Meanwhile, John was carefully tending his Christmas tree plantation, patiently waiting for the first December that he could open his Christmas tree business. By 1994, the agriculture business of asparagus and Christmas trees were enjoying strong local support. John was pleased that all his hard work and attention to detail was paying off.

In January of 1995, John was diagnosed with cancer. Despite a fierce will to live and a courageous fight, he died in September of that year at the age of 42. His love of the land, commitment to quality, and respect for his customers remains a vital part of Mannix Farms to this day.

Shortly after his death, two of John's neighbors took over and operated the farm from 1995–2000. Ed and Tammi Palpant, with the help of Kyle and Lori Spencer, kept the farm operating and planted for 5 years. During that time, sales grew from a few hundred trees per year to over 1000. They also began a country store, an apple orchard, and local school tours for pre-school and elementary ages.

In 2001 Paul and Susan Stinn began operating the farm. They continue it's service (in a slightly different way beginning 2008) in memory of John Mannix and for the glory of God.