Prairie Rose Crabapple
Full bloomMalus ioensis 'Prairie Rose'
Rosaceae · broadleaf deciduous tree · introduced
Last updated
Quick Facts
Bloom Infection Window
Spring Emergence / Primary Infection
Pupation
Phenological Calendar
As of May 13, 2026, Puget Sound stations range from 1906.2 to 2098.2 GDD₃₂. Prairie Rose Crabapple has passed full bloom (1305 GDD₃₂).
Regional Season Tracker
GDD₃₂ accumulation across 7 Puget Sound stations · as of May 13, 2026| Station | GDD₃₂ | Current Stage | Next | To Go |
|---|---|---|---|---|
| Issaquah / East King | 2,098 | Full bloom | — | — |
| Kent / Auburn | 2,089 | Full bloom | — | — |
| Seattle / UW | 2,063 | Full bloom | — | — |
| Olympia / Tumwater | 2,025 | Full bloom | — | — |
| Tacoma / Puyallup | 1,993 | Full bloom | — | — |
| Bellingham / Whatcom | 1,972 | Full bloom | — | — |
| Sequim / Rain Shadow | 1,906 | Full bloom | — | — |
| Stage | GDD32 | Typical Window |
|---|---|---|
| Beginning of flowering BBCH 61 | 990 | Late April (Puget Sound) |
| ● Full bloom BBCH 65 NOW | 1305 | Late April to early May (Puget Sound) |
Source: HortGuide regional interpretation based on Morton Arboretum bloom timing About GDD₃₂ →
Season tracker for Kent / Auburn as of May 13, 2026. Predicted dates use 16-day weather forecast through May 29, 2026, then climate normals.
Diseases: Regionally Documented (3)
Diseases: Other Associations (1)
Pests: Regionally Documented (3)
Prairie Rose is the only common crabapple with truly rosebud-like double pink flowers — the flower form alone justifies the cultivar's place in PNW commerce. Combined with functional fruitlessness (no sidewalk debris, no bird-stained pavement, no fall fruit cleanup), Prairie Rose suits patio, walkway, courtyard, and entry plantings where fruit drop is unacceptable but a unique floral display is desired. The Midwest-native M. ioensis parentage provides better drought tolerance and clay-soil performance than typical Asian-derived ornamental crabapples — useful in PNW landscapes with heavy Green River valley clay or unirrigated parkway sites. The cedar-apple rust susceptibility (rated Poor by JFS) is the cultivar's main caveat elsewhere, but maritime PNW's limited Juniperus virginiana presence substantially reduces real-world rust pressure regionally — the rust caveat matters more in continental climates than in coastal Washington/Oregon. Where Eastern red cedar IS present in the landscape (introduced ornamentals or windbreak plantings), break the rust cycle by relocation. For PNW homeowners or designers wanting a fruitless flowering crabapple with maximum floral impact, 'Prairie Rose' is the standout choice alongside 'Spring Snow' (single white) and 'Marilee®' (double white). Cross-reference: 'Spring Snow' offers no fruit and white single flowers; 'Marilee®' offers no fruit and white double flowers; 'Prairie Rose' offers no fruit and pink double flowers — pick by color preference.
— Chris Welch, ISA Certified Arborist