It is often used as a standout landscape … Traditional Southern magnolia trees grow best in zones 6-10; however, hybrids such as the star magnolia can thrive in areas as cold as zone 4. Its relatively coarse texture can be used to stand it apart from other landscape plants with finer foliage. That’s BIG. How big does Southern magnolia tree grow? This is a relatively low maintenance … Can range from large shrub to 70 ft. tall tree. It is always best to inquire about compatible species while at the … Common Types of Magnolia: Star: Very cold hardy (USDA Zones 4-8) slow growing, broad spreading, small trees or large shrubs that bloom with abandon even when very young.. Saucer: Deciduous trees known for spectacular flowers appearing in late winter and early spring. Southern… That depends on where it’s growing, but the average tree matures anywhere from 60 to 80 feet tall and 40 feet wide after many years. Southern Magnolia is an evergreen tree with a shapely oval form. A commanding presence in the landscape, Magnolia grandiflora (Southern Magnolia) is a magnificent, dense evergreen tree with a straight trunk and a pyramidal to rounded crown. Huge, powerfully … All the charm of a southern magnolia in a smaller size, the little gem magnolia is a popular ornamental choice for people living in hardiness zones 6 through 10.