This cultivar falls into the Artichoke Group, Type 2 and shares its evolution with others in this sub-group from Formosan to Taiwanese and Taiwanese Purple. Long time grower Roger Schmitke selected bulbs from this heritage that produced larger bulbs and cloves then other cultivars grown in the 80s and 90s. These went to Queensland’s Gatton Research Station and over a 6 year period they were grown and selected and replanted, selecting only the biggest and best bulbs and cloves. In 1997 Southern Glen named and released.  See the Production of Garlic here
This day-length neutral cultivar is a very important cultivar for growers in warmer more northern regions.