Japanese Flowering Crabapple

Malus floribunda

Rosaceae · broadleaf deciduous tree · introduced

Last updated March 9, 2026

Data Maturity Structured

This profile synthesizes data from multiple published sources. Expert field review is in progress.

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 24, 2026, Puget Sound stations range from 1455.1 to 1613.4 GDD₃₂. Japanese Flowering Crabapple has passed full bloom (1143 GDD₃₂).

Regional Season Tracker

GDD₃₂ accumulation across 7 Puget Sound stations · as of Apr 24, 2026

Station	GDD₃₂	Current Stage	Next	To Go
Issaquah / East King	1,613	Full bloom	—	—
Seattle / UW	1,574	Full bloom	—	—
Kent / Auburn	1,559	Full bloom	—	—
Olympia / Tumwater	1,524	Full bloom	—	—
Bellingham / Whatcom	1,504	Full bloom	—	—
Tacoma / Puyallup	1,492	Full bloom	—	—
Sequim / Rain Shadow	1,455	Full bloom	—	—

Stage	GDD₃₂	Typical Window	What to Look For
Bloom start BBCH 61	1096	Mar 15-May 15	First open flowers visible; flowers white
● Full bloom BBCH 65 NOW	1143	—	Crown in full flower; heavy pollinator activity
Bud break BBCH 07	—	Feb 15-Mar 15	Buds swelling and beginning to open; first green tissue visible
Leaf emergence BBCH 11	—	Mar 1-Apr 1	First leaves fully unfurled on new growth
Bloom end / petal fall BBCH 69	—	Apr 15-May 31	Last petals falling; flower structures fading
Fruit/seed development BBCH 71	—	Jun 1-Aug 31	Fruit or seed structures forming; fruit color: red
Fruit/seed maturity BBCH 85	—	Sep 1-Nov 30	Fruit fully colored and ripened; seed dispersal may begin
Fall color / leaf senescence BBCH 93	—	Oct 1-Nov 15	Leaves changing color; fall display beginning
Dormancy BBCH 97	—	Nov 15-Feb 28	Leafless; no active growth; dormant buds set

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 24, 2026. Predicted dates use 16-day weather forecast through May 10, 2026, then climate normals.

Diseases (32)

Blueberry mosaic virus and related viruses Virus Diseases Venturia inaequalis Scab Multiple obligate biotrophic fungi (Erysiphales: Erysipha... Powdery Mildew Phytophthora spp Phytophthora fruit rot Perennial Canker (Bull's-eye Rot) Nectria cinnabarina Nectria Twig Blight (Coral Spot) Nectria Canker (European Canker) Fruit russet Fruit Russeting Erwinia amylovora Fire Blight Cytospora spp. (Valsa spp., Leucostoma spp.) Cytospora Canker Rhizobium radiobacter (formerly Agrobacterium tumefaciens) Crown Gall Phytophthora cactorum (primary), P Crown and Collar Rot Burrknot Bitter Pit Apple mosaic Apple Mosaic Apple proliferation Apple Proliferation Apple dead Dead Spur Diplodia seriata and D Diplodia Canker Apple flat Flat Apple Disease Green Crinkle Disease Three viruses Latent Virus Diseases Several different Moldy Core and Core Rots Necrotic Leaf Blotch (Golden Leaf Drop) Isolation attempts Necrotic Leaf Spot Pythium spp., Phytophthora spp., Rhizoctonia spp., Fusari... Replant Disease Apple rubbery wood virus 1 and 2 Rubbery Wood and Flat Limb Thekopsora minima and Naohidemyces vaccinii Rust Apple scar skin viroid Scar Skin and Dapple Apple Botrytis cinerea, Penicillium spp., and others; abiotic d... Storage Problems Tomato ringspot Union Necrosis and Decline Twig Dieback and Canker Phytophthora syringae (primary), P Stem Rot

Quick Facts

Phenological Calendar

Regional Season Tracker

Diseases (32)

Pests (23)