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State Protected and Federally Protected Trees. Before you cut down a magnolia tree, determine whether it is native to the United States and whether it is protected.Trees can be protected at both the state and federal level. Federally protected trees such as Ashe's Magnolia (Magnolia ashei) are considered rare in all parts of their native range.It is illegal to cut down these trees. Other trees such as the cucumber magnolia are not federally protected because they are abundant in most parts of their native range.However, the cucumber magnolia is protected in Indiana because it is rare in its native range there.rees can be protected at both the state and federal level. Federally protected trees such as Ashe's Magnolia (Magnolia ashei) are considered rare in all parts of their native range. It is illegal to cut down these trees.
Big Magnolias. Southern magnolia (Magnolia grandiflora), hardy and evergreen in U.S. Department of Agriculture plant hardiness zones 6 through 10, is one of the genus's largest trees at 60 to 80 feet high and 40 feet wide.Houpu magnolia (M. officinalis var.iloba) grows nearly as tall at 60 to 70 feet high and 35 to 50 feet wide in USDA zones 5 through 8. Cucumber tree magnolia (M. acuminata) reaches 60 to 70 feet high with a spread of 35 to 50 feet.