Picea pungens 'Thume' (Thume Colorado Spruce)


Michael's Opinion

A dwarf compact conifer with attractive silver-blue needles. This shrub is a dense evergreen specimen excellent for rock gardens or other ornamental small spaces and can also be used for general landscaping and mass plantings. With a distinctive pyramidal shape and finely textured and stunning foliage, it is visually appealing throughout the seasons and easily maintained in a number of environments.

Botanical Information

FamilyPinaceae
GenusPicea
Speciespungens
Cultivar'Thume'
CategoryWoody
TypeShrub (evergreen)
Pronunciation

Details

USDA Hardiness Zone3 -7
USDA Hardiness Ref.
Canadian Hardiness Zone1a - 7a
Canada Hardiness Ref.
RHS Hardiness ZoneH7 - H5
RHS Hardiness Ref.
Temperature (°C)(-37) - (-12)
Temperature (°F)(-35) - 10
Height1-3 m
Spread1-3 m
GrowthSlow

Description and Growing Information

General DescriptionA dwarf evergreen that is dense with short, silver-blue needles. Slow growing, retaining its needles and pyramidal shape towards maturity.
ID CharacteristicAttractive silver blue foliage, central leader and conical shape.
ShapePyramidal with horizontal branching to the ground. Compact and mounding.
LandscapeRock gardens, groundcover and borders. Good for erosion control.
CultivationSandy, clay or loam soil with an acidic, neutral or slightly alkaline soil in full sun or partial shade. Drought-tolerant and tolerant of urban pollution.
PestsTolerates deer and rabbits. Can be susceptible to needle cast, canker and rust. Needs to be monitored for aphids (spruce gall aphids), scale, budworms and bagworms. Significant problems with tree health may be caused by spider mites.
HabitatHorticultural origin.
Bark/Stem DescriptionRough, grey.
Flower/Leaf Bud DescriptionRounded to blunt-pointed, 10 mm long; scales papery and reflexed.
Leaf DescriptionShort, 4 angled needles up to 3.5 cm long. Needles point outward from branches in multiple directions with a blue greenish tinge.
Colour DescriptionSilver-blue to powder-blue.
Texture DescriptionStiff, bristly.

Photographs