Japanese Kerria Japanese Rose
Kerria japonica
Rosaceae · broadleaf deciduous shrub · introduced
Last updated
Data Maturity Structured
This profile synthesizes data from multiple published sources. Expert field review is in progress.
Quick Facts
Height
4–8 ft
Spread
6 ft
Growth Rate
Medium
Light
Part Shade
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 4a–8b
Origin
central and western China, several cultivars available
Phenological Calendar
As of April 23, 2026, Puget Sound stations range from 1434.4 to 1592.7 GDD₃₂. Japanese Kerria Japanese Rose has passed 'full bloom' (1229 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 23, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 1,593 | 'Full bloom' | — | — |
| Seattle / UW | 1,554 | 'Full bloom' | — | — |
| Kent / Auburn | 1,537 | 'Full bloom' | — | — |
| Olympia / Tumwater | 1,505 | 'Full bloom' | — | — |
| Bellingham / Whatcom | 1,483 | 'Full bloom' | — | — |
| Tacoma / Puyallup | 1,472 | 'Full bloom' | — | — |
| Sequim / Rain Shadow | 1,434 | 'Full bloom' | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| 'First bloom' BBCH '61' | 1008 | '' |
| ● 'Full bloom' BBCH '65' NOW | 1229 | '' |
Range: 768–918 GDD₃₂
(6yr)
GDD = Growing Degree Days (base 32°F, Jan 1 start). Why base 32? Hover over GDD values for source details. Season tracker for Kent / Auburn as of Apr 23, 2026. Predicted dates use 16-day weather forecast through May 10, 2026, then climate normals.
Diseases (11)
Raspberry bushy dwarf virus and related viruses Virus Thekopsora minima and Naohidemyces vaccinii Rust Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew Peronospora sparsa Downy Mildew Rhizobium radiobacter (formerly Agrobacterium tumefaciens) Crown Gall Coniothyrium wernsdorffiae and Paraconiothyrium fuckelii Common canker Bullhead Kalmusia coniothorium Brand canker Botrytis Bud and Twig Blight [NOTE: Diplocarpon rosae causes black spot on roses (Rosa... Black Spot Chlaropsis thielavioides Black Mold
Pests (13)
Diabrotica undecimpunctata Western spotted cucumber beetle Chloridea virescens Tobacco budworm Thysanoptera Thrips Tetranychidae Spider mite Endelomyia aethiops Roseslug Dasineura rhodophaga Rose midge Edwardsiana rosae Rose leafhopper Diplolepis rosae Rose galls Macrosiphum rosae Rose aphid Otiorhynchus spp. Root weevil Schizura concinna Redhumped caterpillar Tortricidae Leafroller Megachile spp. Leafcutting bee
Cultivars (5)
'Albiflora'
Common name: White Japanese Kerria, Albiflora Japanese Kerria; Mature height: 4–5 ft
Hardy to USDA Zone 4
'Golden Guinea'
Common name: Golden Guinea Japanese Kerria; Mature height: 4–5 ft
Hardy to USDA Zone 4
'Kin Kan'
Common name: Kin Kan Japanese Kerria
Hardy to USDA Zone 4
'Picta'
Common name: Variegated Japanese Kerria, Picta Japanese Kerria; Mature height: 3–4 ft
Hardy to USDA Zone 4
'Pleniflora'
Common name: Double Japanese Kerria; Mature height: 4–8 ft
Hardy to USDA Zone 4