Garden Scheme

Plant library  ·  Shade Trees

Southern Magnolia

Magnolia grandiflora

Southern Magnolia is a large evergreen shade tree for warm-climate landscapes, reaching about 70 feet tall and 40 feet wide. Its glossy foliage, fragrant white flowers, and year-round mass make it most convincing as a single focal tree or as a broad living screen where the site can carry its eventual scale. Reserve it for USDA Zones 7 through 9 and give it a full-sun position with moderate moisture.

  • Pollinator friendly
  • Deer resistant
  • Native to North America
Sunlight Full Sun
Water Moderate
USDA zones 7–9
Spacing 35 ft
Mature size 70 ft tall, 40 ft wide
Bloom Late spring - summer

Placement and use

Use Southern Magnolia as a specimen in a generous lawn opening, at the back of a large border, or in a property-edge planting where its evergreen canopy can form a lasting visual boundary. Keep its trunk and lower canopy well away from the house, overhead lines, driveways, and narrow side yards. A defined planting bed is easier to maintain than turf beneath the tree, allowing room for naturally developing surface roots and seasonal leaf and seedpod drop without interrupting mowing or circulation.[1][2]

Spacing and mature footprint

Set multiple trees 35 feet apart, center to center. Each tree can ultimately spread about 40 feet wide, so mature canopies may touch or overlap at that interval; use wider centers where a distinct open gap, stronger light between trees, or equipment access is important. In a screen, plan the row as a long-term canopy mass rather than a narrow hedge, and leave a service strip along fences, walls, and paths.

Three plants set 35 ft apart, center to center; shaded circles show the 40 ft mature spread.

Sun, water, and soil

Place this tree in full sun and avoid sites that swing between prolonged dryness and standing wetness. A moist, well-drained planting area with organically enriched soil supports a more dependable establishment period. Where the ground is compacted or heavily disturbed, give the tree a broad open root zone instead of confining it between paving, foundations, or tightly packed shrubs.[2]

Seasonal notes

The evergreen canopy holds its place through winter, so account for its shade and visual weight in every season. Large white blooms arrive from late spring into summer, followed by fruiting structures that mature later in the year. Place seating, entries, and frequently swept paving outside the main drip line if falling leaves, seedpods, or fruit would be inconvenient there.[1][3]

Planning caveats

This is not a tree for a small bed or a tight foundation corner. Its eventual height and broad canopy require a site that remains open as the landscape matures, with room to inspect trunks, edge beds, and pass garden equipment around the planting. If the intended space is constrained, select a smaller-form magnolia rather than relying on repeated size control.[2]

Growing facts

Botanical name
Magnolia grandiflora
Type
Shade Tree
Category
Shade Trees
Lifecycle
perennial
USDA hardiness zones
7–9
Sunlight
Full Sun
Water
Moderate
Plant spacing
35 ft
Mature size
70 ft tall, 40 ft wide
Bloom season
Late spring - summer
Pollinator friendly
Yes
Deer resistant
Yes
Native to North America
Yes

References

  1. Southern Magnolia — Gardening Solutions, University of Florida IFAS
  2. Magnolia grandiflora - Plant Finder — Missouri Botanical Garden
  3. Magnolia grandiflora: Southern Magnolia — University of Florida IFAS Extension

Editorial content updated 2026-07-20.