SelecTree: Tree Detail
ST. MARY MAGNOLIA
Magnolia grandiflora 'St. Mary'
Photo Locations: Hoyt Arboretum - Portland, OR and Los Angeles County Arboretum - Arcadia, CA
Utility friendly tree.
Blooms at a young age.
Has fragrant Flower.
Native to Southeastern United States.
Erect or Spreading with a Low Canopy.
Has Evergreen foliage.
Height: 20 - 25 feet.
Width: 15 - 20 feet.
Growth Rate: 24 Inches per Year.
Longevity 50 to 150 years.
Leaves Oval, Dark Green, No Change, Evergreen.
Flowers Showy. Fragrant White. Flowers in Spring, Summer or Fall. Has perfect flowers (male and female parts in each flower).
Prolific, Brown or Purple Follicle, Very Large (Over 3.00 inches), fruiting in Summer or Fall.
Bark Light Green, Fissured.
Shading Capacity Rated as Dense in Leaf.
Litter Issue is Flowers, Dry Fruit and Leaves.
Tree Site Conditions & Constraints
Sunset Zones 4 - 12 and 14 - 24.
Exposure Full Sun to Partial Shade.
Clay, Loam or Sand Texture.
Highly Acidic to Slightly Alkaline Soil pH.
Salinity Tolerance is Moderate on Coast.
Seaside Tolerance is Good in Mild Zone.
Pests & Disease Information
Susceptible to Invasive Shot Hole Borer, Aphids, Scales and Spider Mites, Armillaria, Root Rot and Verticillium.
Health, Safety & Environmental Concerns
Branch Strength Rated as Medium.
Root Damage Potential Rated as Low.
None Known Health Hazard.
Special Uses & Values
Cite this tree:
SelecTree. "Magnolia grandiflora 'St. Mary' Tree Record." 1995-2020. Sep 29, 2020.
< https://selectree.calpoly.edu/tree-detail/magnolia-grandiflora-st-mary >
SelecTree Nursery Connection Map
Cal Poly / ESRI