Adirondack Crabapple

Malus 'Adirondack'

Rosaceae · broadleaf deciduous tree · introduced

Last updated

Data Coverage 4 of 6 dimensions
Site Data
Threats
Cultivars
Phenology
GDD Thresholds
Puget Sound

Malus 'Adirondack' (Rosaceae) is a deciduous ornamental crabapple cultivar noted for its narrow, upright habit and heavy spring bloom. White flowers open from red buds, and small persistent fruit provides winter interest and wildlife food.

This cultivar performs in full sun on well-drained soil. Bloom begins around 260 GDD (base 50 F) with full bloom near 379 GDD. Disease resistance is a key selection trait in modern crabapple breeding. Like all Malus, it benefits from good air circulation to reduce foliar disease pressure.

Quick Facts

Height
12-18 ft
Spread
6-10 ft
Light
Full Sun
Soil
Well Drained
Water
Moderate
Hardiness
Zone Zones 4a–8b
Origin
cultivar from Chinese species

Phenological Calendar

As of April 19, 2026, Puget Sound stations range from 1342.9 to 1500.8 GDD₃₂. Adirondack Crabapple has reached beginning of flowering (1170 GDD₃₂) and is approaching full bloom, predicted around Apr 30.

Regional Season Tracker

GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 19, 2026
Station GDD₃₂ Current Stage Next To Go
Issaquah / East King 1,501 Beginning of flowering Full bloom 205
Seattle / UW 1,465 Beginning of flowering Full bloom 241
Kent / Auburn 1,441 Beginning of flowering Full bloom 265
Olympia / Tumwater 1,415 Beginning of flowering Full bloom 291
Bellingham / Whatcom 1,390 Beginning of flowering Full bloom 316
Tacoma / Puyallup 1,381 Beginning of flowering Full bloom 326
Sequim / Rain Shadow 1,343 Beginning of flowering Full bloom 363
Stage GDD32 Typical Window
● Beginning of flowering BBCH 61 NOW 1170 —
○ Full bloom BBCH 65 NEXT 1706 — est. Apr 30 (forecast)
Regional estimate
Range: 728–874 GDD₃₂ (6yr)

GDD = Growing Degree Days (base 32°F, Jan 1 start). Why base 32? Source GDD₅₀ thresholds from Herms 2004 (OSU, Secrest Arboretum, Ohio) and UMD IPMnet (Gill & Klick, mid-Atlantic), converted to GDD₃₂ via Kent bloom-date mapping. Season tracker for Kent / Auburn as of Apr 19, 2026. Predicted dates use 16-day weather forecast through May 5, 2026, then climate normals.

Diseases (4)