Brewer's Oak
'Fall color / leaf senescence'Quercus garryana var. breweri
Fagaceae · broadleaf deciduous shrub · native
Last updated
Quercus garryana var. breweri (Fagaceae) is the shrub form of Oregon white oak. It grows only 5 to 6 feet tall, forming a low, spreading thicket on dry, rocky sites. The leaves are similar to the tree form but smaller.
Brewer's oak inhabits dry, exposed sites at higher elevations than the tree form. It grows in full sun on well-drained, rocky soils with minimal water needs. The dwarf habit makes it potentially useful for native-plant gardens where space is limited. Hardy in Zones 3b to 8b.
Plant Profile
Size & Form
Ornamental Interest
Peak Spore Production and Dispersal
Active Conidial Spread
Active Infection & Secondary Spread
Active Below-ground Growth
+ 3 more — see full disease and pest lists below
Diseases: Regionally Documented (13)
Pests: Regionally Documented (14)
Phenological Calendar
As of June 3, 2026, Puget Sound stations range from 2435.5 to 2672.8 GDD₃₂. Brewer's Oak has passed 'fall color / leaf senescence' (1774 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Jun 3, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,673 | 'Fall color / leaf senescence' | — | — |
| Kent / Auburn | 2,665 | 'Fall color / leaf senescence' | — | — |
| Seattle / UW | 2,610 | 'Fall color / leaf senescence' | — | — |
| Olympia / Tumwater | 2,570 | 'Fall color / leaf senescence' | — | — |
| Tacoma / Puyallup | 2,535 | 'Fall color / leaf senescence' | — | — |
| Bellingham / Whatcom | 2,533 | 'Fall color / leaf senescence' | — | — |
| Sequim / Rain Shadow | 2,436 | 'Fall color / leaf senescence' | — | — |
View full calendar (6 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| 'Bud break' BBCH '07' | 1212 | '' |
| 'Full bloom' BBCH '65' | 1495 | '' |
| 'Leaf emergence' BBCH '11' | 1514 | '' |
| 'Flower buds visible' BBCH '51' | 1572 | '' |
| 'First bloom' BBCH '61' | 1594 | '' |
| ● 'Fall color / leaf senescence' BBCH '93' NOW | 1774 | '' |
Source: 'NPN citizen science observations (WA+OR), n=220, median. services.usanpn.org' About GDD₃₂ →
Season tracker for Kent / Auburn as of Jun 3, 2026. Predicted dates use 16-day weather forecast through Jun 19, 2026, then climate normals.