English Ivy
Hedera helix
Araliaceae · vine groundcover · introduced
Last updated
Data Coverage 4 of 6 dimensions
Quick Facts
Height
49 ft
Spread
16 ft
Growth Rate
Medium
Light
Full Sun to Shade
Soil
Wet Tolerant
Water
High
Hardiness
Zone Zones 4a–8b
Bloom Time
September to October
Origin
the Caucasian Mountains
Phenological Calendar
As of April 9, 2026, Puget Sound stations range from 1181.7 to 1312.1 GDD₃₂. English Ivy typically reaches 'bud break' at 1474 GDD₃₂, predicted around Apr 24.
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 9, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,312 | Pre-season | 'Bud break' | 162 |
| Seattle / UW | 1,289 | Pre-season | 'Bud break' | 185 |
| Kent / Auburn | 1,246 | Pre-season | 'Bud break' | 228 |
| Olympia / Tumwater | 1,227 | Pre-season | 'Bud break' | 247 |
| Bellingham / Whatcom | 1,213 | Pre-season | 'Bud break' | 261 |
| Tacoma / Puyallup | 1,198 | Pre-season | 'Bud break' | 276 |
| Sequim / Rain Shadow | 1,182 | Pre-season | 'Bud break' | 292 |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ○ 'Bud break' BBCH '07' NEXT | 1474 | '' est. Apr 24 (forecast) |
| 'First bloom' BBCH '61' | 1763 | '' est. May 8 (avg) |
| 'Flower buds visible' BBCH '51' | 1763 | '' est. May 8 (avg) |
GDD = Growing Degree Days (base 32°F, Jan 1 start). Why base 32? GDD₃₂ thresholds from USA National Phenology Network citizen science observations (WA+OR). Season tracker for Kent / Auburn as of Apr 9, 2026. Predicted dates use 16-day weather forecast through Apr 25, 2026, then climate normals.