Southern Magnolia - Magnolia Grandiflora
Sunset Zones: 4-12 and 14-24; H1, H2
USDA Hardiness Zones: 7-9
Sun Exposure: Full Sun to Partial Shade
Soil: Highly Acidic to Slightly Alkaline
Drought Tolerance: Intolerant of Drought
Growth Rate: 24” per year
Growth Habit: Oval, Rounded or Umbrella Shape
Evergreen or Deciduous: Evergreen
Longevity: Greater than 150 years
Litter Issue: Flowers, Leaves, and Dry Fruit
Pests and Diseases: Susceptible to Invasive Shot Hole Borer, Aphids, Scales and Spider Mites, Armillaria, Root Rot and Verticillium.
Branch Strength: Medium
Root Damage Potential: High
Suckering Potential: Low
Salt Tolerance: Moderate
Special Care: Plant the tree 2 inches above the surrounding soil to encourage roots to grow downward. If planted too deep this encourages lateral and upward root growth. This will result in a tree that is less stable in the landscape.
Pruning Advice: Generally, southern magnolia does not require much pruning to develop a strong structure. If left unpruned, the tree limbs can reach the ground (MFC, 2007). Pruning should be done during the growing season, after blooming, as the tree does not heal well during dormancy
Watering Advice: Watering should continue for 3-5 years until the roots are fully established.
Staking: Staking will be required when young.
Fertilizer: Applying ½ lb of 10-10-10 fertilizer at the base of the tree in March, May, and July during the first year of establishment will accelerate growth. Avoid fertilizing in Fall and Winter.
Microclimate: Prefers a wind sheltered spot in the desert, but not completely necessary. - What is a Microclimate?