 South Texas also acquired what is known as the 1015 onion in the early 1980s by Dr. Leonard M. Pike, a horticulture professor at Texas A&M University, Texas.1015 Onions are named for their optimum planting date, October 15.Grown only in the Rio Grande Valley of South Texas, this large, prized onion was developed after ten years of extensive research, endless testing and a million dollars in cost.