Solomon's seal
Polygonatum odoratum
Asparagaceae · perennial · introduced
Last updated
Polygonatum odoratum (Asparagaceae) is a rhizomatous herbaceous perennial native across Eurasia from Europe to Japan. It grows 1 to 2 feet tall with arching stems bearing alternate, oval leaves arranged in two ranks. Small, tubular, white, fragrant flowers hang in pairs from the leaf axils in spring, followed by blue-black berries.
Fragrant Solomon's seal thrives in part shade to full shade on moist, humus-rich, well-drained soil. It spreads slowly by rhizomes to form graceful colonies. The variegated cultivar 'Variegatum' (white-edged leaves) is widely grown. The species is deer resistant and virtually pest- and disease-free. Hardy in Zones 3 to 8.
Quick Facts
Field Observations
Phenological Calendar
As of May 21, 2026, Puget Sound stations range from 2097.8 to 2307.4 GDD₃₂. Solomon's seal has passed full bloom (2268 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 21, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,307 | Full bloom | — | — |
| Kent / Auburn | 2,282 | Full bloom | — | — |
| Seattle / UW | 2,246 | Pre-season | Full bloom | 22 |
| Olympia / Tumwater | 2,208 | Pre-season | Full bloom | 60 |
| Tacoma / Puyallup | 2,174 | Pre-season | Full bloom | 94 |
| Bellingham / Whatcom | 2,174 | Pre-season | Full bloom | 94 |
| Sequim / Rain Shadow | 2,098 | Pre-season | Full bloom | 170 |
| Stage | GDD32 | Typical Window |
|---|---|---|
| ● Full bloom BBCH 65 NOW | 2268 | Mid to late May |
Source: Field observation, Issaquah, WA, 2026-05-21 About GDD₃₂ →
Season tracker for Kent / Auburn as of May 21, 2026. Predicted dates use 16-day weather forecast through Jun 6, 2026, then climate normals.