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Blue Mist Spiraea, Bluebeard
Caryopteris x clandonensis 'Arthur Simmonds'

Family: Lamiaceae (lay-mee-AY-see-ee) (Info)
Genus: Caryopteris (kar-ee-OP-ter-iss) (Info)
Species: x clandonensis (klan-don-EN-sis) (Info)
Cultivar: Arthur Simmonds





36-48 in. (90-120 cm)


36-48 in. (90-120 cm)


USDA Zone 5a: to -28.8 C (-20 F)

USDA Zone 5b: to -26.1 C (-15 F)

USDA Zone 6a: to -23.3 C (-10 F)

USDA Zone 6b: to -20.5 C (-5 F)

USDA Zone 7a: to -17.7 C (0 F)

USDA Zone 7b: to -14.9 C (5 F)

USDA Zone 8a: to -12.2 C (10 F)

USDA Zone 8b: to -9.4 C (15 F)

Sun Exposure:

Full Sun


Unknown - Tell us

Bloom Color:

Light Blue

Bloom Time:

Mid Summer

Late Summer/Early Fall





Other details:

This plant is attractive to bees, butterflies and/or birds

Drought-tolerant; suitable for xeriscaping

Average Water Needs; Water regularly; do not overwater

This plant is resistant to deer

Soil pH requirements:

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

Patent Information:

Unknown - Tell us

Propagation Methods:

From softwood cuttings

From semi-hardwood cuttings

Seed Collecting:

N/A: plant does not set seed, flowers are sterile, or plants will not come true from seed


This plant has been said to grow in the following regions:

Chicago, Illinois

Naperville, Illinois

Winnetka, Illinois

Cambridge, Wisconsin

Gardeners' Notes:


On Sep 4, 2006, saya from Heerlen
Netherlands (Zone 8b) wrote:

Native to Mongolia and parts of China and Japan, bluebeard thrives in full sun in its home range of steep hills and dry, infertile soil. 'Arthur Simmonds', is the result of a cross between Caryopteris incana and Caryopteris mongholica.
The original hybrid was raised in plantsman Arthur Simmonds' garden in Surrey, England, in 1933 and belongs to that group of plants known as dieback shrubs. These are soft-wooded shrubs or subshrubs that behave more like herbaceous perennials than like woody shrubs. Their above-ground growth tends to die back, anywhere from a few inches from their tips all the way down to the base of the plant. But the roots remain hardy to zone 5 if planted on a sheltered spot. It is said that 'Arthur Simmonds' is a little more hardier.
AGM in 1941.