Umbrella Magnolia Umbrella Tree
Full bloomMagnolia tripetala
Magnoliaceae · broadleaf deciduous tree · native
Last updated
Quick Facts
Height
30 ft
Spread
15-30 ft
Growth Rate
Moderate
Light
Part Shade
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 6a–8b
Bloom Time
May
Fall Color
Yellow
Origin
southern Pennsylvania to northern Georgia and Alabama to Kentucky and Arkansas
Watch for this season
Bacterial BlightHigh
Spring Infection Period
Root Colonization Period
Powdery MildewModerate
Spring Emergence / Primary Infection
Phenological Calendar
As of May 14, 2026, Puget Sound stations range from 1926.1 to 2121.1 GDD₃₂. Umbrella Magnolia Umbrella Tree has passed full bloom (1824 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 14, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,121 | Full bloom | — | — |
| Kent / Auburn | 2,113 | Full bloom | — | — |
| Seattle / UW | 2,085 | Full bloom | — | — |
| Olympia / Tumwater | 2,047 | Full bloom | — | — |
| Tacoma / Puyallup | 2,016 | Full bloom | — | — |
| Bellingham / Whatcom | 1,994 | Full bloom | — | — |
| Sequim / Rain Shadow | 1,926 | Full bloom | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| Bloom start BBCH 61 | 1368 | Mar 15-May 15 |
| ● Full bloom BBCH 65 NOW | 1824 | — |
| Bud break BBCH 07 | — | Feb 15-Mar 15 |
| Leaf emergence BBCH 11 | — | Mar 1-Apr 1 |
| Bloom end / petal fall BBCH 69 | — | Apr 15-May 31 |
| Fruit/seed development BBCH 71 | — | Jun 1-Aug 31 |
| Leaf drop BBCH 93 | — | Oct 15-Nov 30 |
| Dormancy BBCH 97 | — | Nov 15-Feb 28 |
Range: 917–1105 GDD₃₂
(6yr)
Sources: USDA Plants Database (seasonal estimate) ; OSU phenology catalog (OSU: weather.cfaes.osu.edu) About GDD₃₂ →
Season tracker for Kent / Auburn as of May 14, 2026. Predicted dates use 16-day weather forecast through May 30, 2026, then climate normals.
Diseases: Regionally Documented (5)
Data Maturity Structured Multiple sources. Expert review underway.