American Smoketree
Cotinus obovatus
Anacardiaceae · broadleaf deciduous shrub · introduced
Last updated
Plant Profile
Size & Form
Height
20-30 ft
Spread
26 ft
Growth Rate
Medium
Site Requirements
Light
Full Sun
Soil Drainage
Moist
Soil pH
adaptable (acidic to alkaline)
Water
Moderate
Drought Tolerance
Moderate to high
Hardiness
Zones 4a–8b
Ornamental Interest
Bloom Time
May to June
Fall Color
Orange, purple, red, yellow
Origin
rocky, usually mountain soils from Kentucky
Watch for this season
Powdery MildewHigh
Active Conidial Spread
Root Colonization Period
Diseases: Regionally Documented (2)
Phenological Calendar
As of June 3, 2026, Puget Sound stations range from 2435.5 to 2672.8 GDD₃₂. American Smoketree has passed 'full bloom' (2450 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 | 'Full bloom' | — | — |
| Kent / Auburn | 2,665 | 'Full bloom' | — | — |
| Seattle / UW | 2,610 | 'Full bloom' | — | — |
| Olympia / Tumwater | 2,570 | 'Full bloom' | — | — |
| Tacoma / Puyallup | 2,535 | 'Full bloom' | — | — |
| Bellingham / Whatcom | 2,533 | 'Full bloom' | — | — |
| Sequim / Rain Shadow | 2,436 | Pre-season | 'Full bloom' | 15 |
View full calendar (1 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● 'Full bloom' BBCH '65' NOW | 2450 | '' |
Range: 1737–2006 GDD₃₂
(6yr)
Source: 'Master catalog (UMD), converted GDD50->GDD32 via Kent bloom-date mapping' 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.
Data Maturity Baseline Extension data. Expert review underway.