Categories Shrubs & Trees | Magnolia grandiflora Southern Magnolia Description Popular name(s): Southern Magnolia, Bull Bay Botanical name: Magnolia grandiflora Family: Magnoliaceae Origin: North America (USA) Height: Up to 25 metres USDA zone: 7 (-12 °C) Related plants:Magnolia liliiflora cv. Magnolia stellata Magnolia × soulangeana