You Will Get 5 Seeds Magnolia Grandiflora Narrow Southern Magnolia. It is a beautiful US native tree that gets great glossy evergreen foliage and large fragrant white flowers, but the most unique part of this variety is that it grows in a very narrow and upright manner, with larger trees being 30 feet tall but only 8 to 10 feet wide, which makes them a good choice for smaller spaces.. These beautiful plants are hardy to USDA zone 6, and they grow best in full sun to part shade.. They would make excellent additions to your rare plant collection, or just make a unique statement in your yard.