Persian Lilac
Syringa x persica
Oleaceae · [VERIFY] · introduced
Last updated
Persian lilac is a hybrid shrub reaching 6-10 feet tall with a more delicate, refined form than common lilac. The plant produces fragrant flowers in lighter shades of pink, purple, or white arranged in smaller, more elegant panicles appearing in late spring.
Persian lilac is hardy to zones 4-8 and thrives in full sun with well-drained soil. It is less coarse and more graceful than common lilac and is less susceptible to mildew in humid conditions. Multiple cultivars are available; the plants require pruning after flowering to maintain shape.
Quick Facts
Phenological Calendar
As of May 24, 2026, Puget Sound stations range from 2172.5 to 2394 GDD₃₂. Persian Lilac has passed full bloom (1364 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 | Full bloom | — | — |
| Olympia / Tumwater | 2,295 | Full bloom | — | — |
| Tacoma / Puyallup | 2,259 | Full bloom | — | — |
| Bellingham / Whatcom | 2,256 | Full bloom | — | — |
| Sequim / Rain Shadow | 2,173 | Full bloom | — | — |
View full calendar (2 stages)
| Stage | GDD32 | Typical Window |
|---|---|---|
| Beginning of flowering BBCH 61 | 1080 | — |
| ● Full bloom BBCH 65 NOW | 1364 | — |
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.