Bigleaf Magnolia

Magnolia macrophylla

Magnoliaceae · broadleaf deciduous tree · native

Last updated

Quick Facts

Height
30–40 ft
Spread
32 ft
Growth Rate
Slow
Light
Full Sun to Part Shade
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 5a–8b
Bloom Time
May
Fall Color
Insignificant
Origin
from Ohio to Florida and west to Arkansas and Louisiana
Watch for this season
Bacterial BlightHigh

Spring Infection Period

Verticillium WiltHigh

Root Colonization Period

Powdery MildewModerate

Spring Emergence / Primary Infection

Field Observations

Magnolia macrophylla - new leaf
Field Observation
Magnolia macrophylla · Bigleaf Magnolia
new leaf
April 20, 2026 · Lake Wilderness Arboretum · 1,509 GDD₃₂ · BBCH 11

Phenological Calendar

Stage Typical Window
Leaf emergence BBCH 11 —

Diseases: Regionally Documented (5)

Data Maturity
Baseline Extension data. Expert review underway.