American Yellowwood

Cladrastis kentukea

Fabaceae · broadleaf deciduous tree · introduced

Last updated

American yellowwood (Cladrastis kentukea, Fabaceae) is a deciduous tree native to the southeastern United States (North Carolina, Tennessee, and surrounding states), where it occurs naturally on limestone cliffs and ridges. It reaches 30 to 50 feet tall with low branching and a broad, rounded crown of delicate branches. Odd-pinnately compound leaves (20 to 30 centimeters, 7 to 9 leaflets) turn yellow-orange in fall. Small, fragrant white flowers hang in pendulous clusters in May to June, followed by brown legume pods.

American yellowwood grows in sun to part shade on well-drained soils across a broad pH range (4.8 to 7.5) with low water needs and drought tolerance once established, hardy in Zones 4a to 8b. Growth is moderate, reaching about 25 feet at 20 years. No pest or disease issues are documented. No cultivars are in the trade. The tree provides nesting sites for songbirds and pollen and nectar for bees and pollinators.

Quick Facts

Height
30–50 ft
Spread
40-45 ft
Growth Rate
Moderate
Light
Sun to Part Shade
Soil
Well Drained
Water
Low
Hardiness
Zones 4a–8b
Bloom Time
May
Fall Color
Brown
Origin
limestone cliffs and ridges

Phenological Calendar

As of May 24, 2026, Puget Sound stations range from 2172.5 to 2394 GDD₃₂. American Yellowwood has passed 'full bloom' (2336 GDD₃₂).

Regional Season Tracker

GDD₃₂ accumulation across 7 Puget Sound stations · as of May 24, 2026
Station GDD₃₂ Current Stage Next To Go
Issaquah / East King 2,394 'Full bloom'
Kent / Auburn 2,373 'Full bloom'
Seattle / UW 2,332 'First bloom' 'Full bloom' 4
Olympia / Tumwater 2,295 'First bloom' 'Full bloom' 41
Tacoma / Puyallup 2,259 'First bloom' 'Full bloom' 77
Bellingham / Whatcom 2,256 'First bloom' 'Full bloom' 81
Sequim / Rain Shadow 2,173 'First bloom' 'Full bloom' 164
View full calendar (2 stages)
Stage GDD32 Typical Window
'First bloom' BBCH '61' 2049 ''
'Full bloom' BBCH '65' NOW 2336 ''
Range: 1621–1894 GDD₃₂ (6yr)

Source: 'Master catalog (OSU, UMD), converted GDD50->GDD32 via Kent bloom-date mapping' About GDD₃₂ →

Season tracker for Kent / Auburn as of May 24, 2026. Predicted dates use 16-day weather forecast through Jun 9, 2026, then climate normals.

Data Maturity
Baseline Extension data. Expert review underway.