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Japanese Flowering Crabapple

Malus floribunda

Rosaceae · broadleaf deciduous tree · introduced

Last updated

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

Quick Facts

Height
20–25 ft
Spread
32 ft
Growth Rate
Moderate
Light
Full Sun
Soil
Moist
Water
Moderate
Hardiness
Zone Zones 3a–9b
Bloom Time
April
Origin
Japan and East Asia; a hybrid possibly composed of M.

Phenological Calendar

As of April 3, 2026, Puget Sound stations range from 1070 to 1180.6 GDD₃₂. Japanese Flowering Crabapple has reached bloom start (1096 GDD₃₂) and is approaching full bloom, predicted around Apr 5.

Regional Season Tracker

GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 3, 2026
Station GDD₃₂ Current Stage Next To Go
Issaquah / East King 1,181 Full bloom — —
Seattle / UW 1,171 Full bloom — —
Kent / Auburn 1,111 Bloom start Full bloom 32
Olympia / Tumwater 1,106 Bloom start Full bloom 37
Bellingham / Whatcom 1,101 Bloom start Full bloom 42
Tacoma / Puyallup 1,075 Pre-season Bloom start 21
Sequim / Rain Shadow 1,070 Pre-season Bloom start 26
Stage GDD32 Typical Window
● Bloom start BBCH 61 NOW 1096 Mar 15-May 15
○ Full bloom BBCH 65 NEXT 1143 — est. Apr 5 (forecast)
Bud break BBCH 07 — Feb 15-Mar 15
Leaf emergence BBCH 11 — Mar 1-Apr 1
Bloom end / petal fall BBCH 69 — Apr 15-May 31
Fruit/seed development BBCH 71 — Jun 1-Aug 31
Fruit/seed maturity BBCH 85 — Sep 1-Nov 30
Fall color / leaf senescence BBCH 93 — Oct 1-Nov 15
Dormancy BBCH 97 — Nov 15-Feb 28
Regional estimate
Range: 611–758 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 3, 2026. Predicted dates use 16-day weather forecast through Apr 19, 2026, then climate normals.

Diseases (36)

Blueberry mosaic virus and related viruses Virus Diseases Venturia inaequalis Scab Podosphaera aphanis var. aphanis Powdery Mildew Phytophthora spp Phytophthora fruit rot Cryptosporiopsis perennans Perennial Canker (Bull's-eye Rot) Nectria cinnabarina Nectria Twig Blight (Coral Spot) Neonectria ditissima Nectria Canker (European Canker) Fruit russet Fruit Russeting Erwinia amylovora Fire Blight Cytospora canker Cytospora Canker Rhizobium radiobacter (formerly Agrobacterium tumefaciens) Crown Gall Phytophthora cactorum (primary), P Crown and Collar Rot Non-pathogenic (genetic/physiological) Burrknot Non-pathogenic (calcium deficiency) Bitter Pit Neofabraea spp. (N Anthracnose and Bull's-eye rot Cryptosporiopsis curvispora Anthracnose (Bull's-eye Rot) Apple mosaic Apple Mosaic Apple proliferation Apple Proliferation Cryptosporiopsis curvispora Bull's-eye Rot Apple dead Dead Spur Diplodia seriata and D Diplodia Canker Apple flat Flat Apple Disease Phytophthora cactorum Fruit Rot, Phytophthora This disease Green Crinkle Disease Three viruses Latent Virus Diseases Several different Moldy Core and Core Rots Non-pathogenic (physiological) Necrotic Leaf Blotch (Golden Leaf Drop) Isolation attempts Necrotic Leaf Spot Pythium spp., Phytophthora spp., Rhizoctonia spp., Fusari... Replant Disease These diseases Rubbery Wood and Flat Limb Thekopsora minima and Naohidemyces vaccinii Rust These diseases Scar Skin and Dapple Apple Botrytis cinerea, Penicillium spp., and others; abiotic d... Storage Problems Tomato ringspot Union Necrosis and Decline Phacidiopycnis washingtonensis Twig Dieback and Canker Phytophthora syringae (primary), P Stem Rot

Pests (23)