Sweet Mockorange
Philadelphus coronarius
Hydrangeaceae · [VERIFY] · introduced
Last updated
Philadelphus coronarius (Hydrangeaceae) is a deciduous shrub native to southeastern Europe and western Asia. It grows 6 to 10 feet tall with an upright, arching habit. In late spring, clusters of intensely fragrant white flowers (about 1 inch across) cover the plant. The fragrance is considered among the finest of any temperate shrub.
Sweet mockorange grows in full sun to part shade on a range of well-drained soils. It blooms on old wood, so pruning should follow flowering. The species is vigorous and may become leggy without periodic renewal pruning (removing oldest canes at ground level). No serious pest or disease problems are typical.
Quick Facts
Phenological Calendar
As of May 24, 2026, Puget Sound stations range from 2172.5 to 2394 GDD₃₂. Sweet Mockorange has reached beginning of flowering (1832 GDD₃₂) and is approaching full bloom, predicted around May 27.
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 | Beginning of flowering | Full bloom | 44 |
| Kent / Auburn | 2,373 | Beginning of flowering | Full bloom | 65 |
| Seattle / UW | 2,332 | Beginning of flowering | Full bloom | 106 |
| Olympia / Tumwater | 2,295 | Beginning of flowering | Full bloom | 143 |
| Tacoma / Puyallup | 2,259 | Beginning of flowering | Full bloom | 179 |
| Bellingham / Whatcom | 2,256 | Beginning of flowering | Full bloom | 183 |
| Sequim / Rain Shadow | 2,173 | Beginning of flowering | Full bloom | 266 |
View full calendar (2 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● Beginning of flowering BBCH 61 NOW | 1832 | — |
| ○ Full bloom BBCH 65 NEXT | 2438 | — est. May 27 (forecast) |
Source: OSU phenology catalog (OSU: weather.cfaes.osu.edu) 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.