Juniperus squamata 'Blue Star' (Blue Star Single Seed Juniper)


Michael's Opinion

This is an award winning juniper with attractive, year-round blue foliage. The plant will not tolerate any standing water, heat or humidity but does tolerate deer, drought, pollution, rabbits, seashores, slopes and winds. Its life span is 30 years and grows up to 2 m. The rich foliage may decline in high humidity and in high night temperatures. Provides a striking contrast among other conifers.

Botanical Information

FamilyCupressaceae
GenusJuniperus
Speciessquamata
Cultivar'Blue Star'
CategoryWoody
TypeShrub (evergreen)
ReferencesMicheal. A., Dirr. Manual of Woody Landscape Plants. Sixth Edition, Jan 30 2013.
Origin'Blue Star' is a mutation of the Juniperus cultivar ‘Meyeri’, discovered in Holland and introduced into the market in 1964.
Pronunciation

Details

USDA Hardiness Zone4 - 8
USDA Hardiness Ref.
Canadian Hardiness Zone2a - 8a
Canada Hardiness Ref.
RHS Hardiness ZoneH4 - H7
RHS Hardiness Ref.
Temperature (°C)-35 - (-7)
Temperature (°F)-30 - 20
Height30 - 90 cm
Spread30 - 120 cm
GrowthSlow

Description and Growing Information

General DescriptionJuniperus squamata 'Blue Star' is a ground-covering juniper with shaggy, cinnamon bark and pretty blue, star-shaped needles.
ID CharacteristicPale blue-green foliage, unique among the conifers. Needles form a star-shape.
ShapeBushy, low-mounded hemispherical.
LandscapeCan be grown as ground cover, over slopes and where runoff is a problem. Makes a striking contrast among other conifers. Can be trained to grow like a tree or rounded, squat shrub, small compact bush or along retaining walls.
PropagationBy ripe cuttings taken in late autumn through winter. Also by roots held in a humid cold frame or soft cuttings taken in the summer and placed over bottom heat and under a misting system.
CultivationGrow in full sun to part shade, in soil with a pH range of 5.5 - 8.5, containing mostly sand to clay loam. Fertilize yearly, avoiding the late growing season. Adaptable to both dry and moist growing conditions, mulch is recommended, AHS heat zone 1 - 5.
PestsPossible problems include: leaf miners, bark beetles, scale insects, aphids, mites, caterpillars, bagworms, phomopsis twig blight, gymosporangium rust, dieback, canker, lesion nematodes, brown felt blight, and heart and wood rots.
Notable SpecimensThe Gardens of Fanshawe College (Conifer Garden), London, Ontario, Canada.
HabitatHorticultural origin.
Bark/Stem DescriptionExfoliating, shaggy cinnamon bark, moderately fissured.
Leaf DescriptionNeedles are awl-shaped and silver blue, in whorls of 3 radially arranged around branches so that they look like stars.
Fruit DescriptionBlack, insignificant ornamentally. Berry-like female cones containing a single seed.
Colour DescriptionSilver-blue.
Texture DescriptionExtremely fine, delicate and sharp.

Photographs