Rejoice Crabapple
Full bloomMalus 'Rejzam'
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. Rejoice 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)
Rejoice™ is a Lake County ZAM-series narrow-upright crabapple (Zampini origin) bred for nursery uniformity and street-tree applications. The 20 × 10 ft narrow upright oval form fits sidewalk planting strips and tight residential corners. The cultivar's red- tinted spring foliage that matures through bronze green to deep green adds subtle multi-season interest, and the pale rose-pink flowers offer a softer color than the saturated pinks of cultivars like 'Prairifire' or 'Purple Prince'. Disease resistance is good across all four major diseases (mostly Good ratings, Excellent on mildew) per JFS. For PNW street-tree applications and uniform commercial landscape installations, Rejoice is a viable competitor to other narrow-upright cultivars. Cross-reference narrow upright decision tree: 'Adirondack' (10 × 18 ft narrower, white flowers, excellent disease resistance), 'Ivory Spear®' (7 × 18 ft narrowest, white flowers), 'Coral Spear™' (8 × 20 ft, pink flowers), 'Rejoice™' (10 × 20 ft, pale rose-pink flowers). Cross-reference narrow upright decision tree: 'Adirondack' (white, excellent disease), 'Ivory Spear' (white, narrowest), 'Coral Spear' (pink), 'Rejoice' (pale rose-pink).
— Chris Welch, ISA Certified Arborist