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

Height
2-3 ft
Spread
0-1 ft
Light
Part Shade to Full Shade
Water
Moderate to high
Hardiness
Zones 3–8
Bloom Time
april to may
Origin
Asia, Europe

Field Observations

Polygonatum odoratum ‘s Seal (*Polygonatum odoratum*’ - in bloom
Field Observation
Polygonatum odoratum ‘s Seal (*Polygonatum odoratum*’ · Solomon's Seal
in bloom
May 21, 2026 · Issaquah · 2,268 GDD₃₂ · BBCH 65

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.

Data Maturity
Baseline Extension data. Expert review underway.