Mountain Spray

Holodiscus dumosus

Rosaceae · broadleaf deciduous shrub · native

Last updated March 8, 2026

Plant Profile

Size & Form

Height

5–20 ft

Growth Rate

Moderate

Size at 20 yr

2 ft

Lifespan

Moderate

Site Requirements

Light

Full Sun

Soil Drainage

Well Drained

Soil pH

7.0-8.0

Water

Low

Drought Tolerance

High

Hardiness

Zones 3a–8b

Ornamental Interest

Bloom Time

late summer

Origin

extends from central Idaho south to southern Arizona and the Big Bend region of Texas and east to the edge of the plains grasslands in east-central Wyoming

Diseases: Regionally Documented (1)

Symptom category — not a single disease Leaf Spot

Phenological Calendar

View full calendar (8 stages)

Stage	Typical Window	What to Look For
Bud break BBCH 07	May 15-Jun 15	Buds swelling and beginning to open; first green tissue visible
Leaf emergence BBCH 11	Jun 1-Jul 1	First leaves fully unfurled on new growth
Bloom start BBCH 61	Aug 1-Aug 31	First open flowers visible; flowers white
Bloom end / petal fall BBCH 69	Aug 15-Sep 15	Last petals falling; flower structures fading
Fruit/seed development BBCH 71	Jun 1-Aug 31	Fruit or seed structures forming; fruit color: brown
Fruit/seed maturity BBCH 85	Sep 1-Nov 30	Fruit fully colored and ripened; seed dispersal may begin
Leaf drop BBCH 93	Oct 15-Nov 30	Leaves yellowing and dropping; no significant fall color display
Dormancy BBCH 97	Nov 15-Feb 28	Leafless; no active growth; dormant buds set

Data Maturity

Baseline Extension data. Expert review underway.