Bigleaf Magnolia

Magnolia macrophylla

Magnoliaceae · broadleaf deciduous tree · introduced

Last updated

Plant Profile

Size & Form

Height
30–40 ft
Spread
32 ft
Growth Rate
Slow

Site Requirements

Light
Full Sun to Part Shade
Soil Drainage
Moist
Soil pH
4.5-7.0
Water
Moderate
Drought Tolerance
Moderate
Hardiness
Zones 5a–8b

Ornamental Interest

Bloom Time
May
Fall Color
Insignificant
Origin
from Ohio to Florida and west to Arkansas and Louisiana

Field Observations

Bigleaf Magnolia new leaf
Bigleaf Magnolia: New leaf
April 20, 2026 · Lake Wilderness Arboretum
Watch for this season
Powdery MildewHigh

Active Conidial Spread

Verticillium WiltHigh

Root Colonization Period

Diseases: Regionally Documented (5)

Phenological Calendar

View full calendar (1 stages)
Stage Typical Window
Leaf emergence BBCH 11 — Observed
Data Maturity
Baseline Extension data. Expert review underway.