Rockspray Cotoneaster

Cotoneaster horizontalis

Rosaceae · broadleaf deciduous shrub · introduced

Last updated May 10, 2026

Quick Facts

Height

4 ft

Spread

6-8 ft

Growth Rate

Fast

Light

Part Shade

Soil

Adaptable

Water

Moderate

Hardiness

Zone Zones 4a–8b

Bloom Time

May to June

Fall Color

Red

Origin

Western China

Spring Infection Period

Bloom Infection Window

Growing Season Stress Expression

AphidModerate

Spring Colonization

Stage	Typical Window	What to Look For
New growth flush BBCH 11	Feb 15-Mar 15	Lighter-colored new growth visible at branch tips
Bloom start BBCH 61	Mar 15-May 15	First open flowers visible; flowers white
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

Data Maturity

Structured Multiple sources. Expert review underway.