Hardiness
Zone 3
Discover the plant
Colorado Blue Spruce 'St. Mary's Broom'
FamilyPinaceae
Picea pungens 'St. Mary's Broom', known as 'St. Mary's Broom' blue spruce, is a very compact dwarf conifer valued for its dense habit and remarkable bluish coloration. This variety, originating from a witches' broom, forms an extremely tight, small, globular shrub that adds texture and contrast to rockeries, dwarf conifer beds, and alpine gardens. Its short, rigid needles display a silvery-blue to steel-blue hue typical of blue spruces, creating a luminous and decorative effect all year round. Thanks to its slow growth and naturally regular shape, this plant maintains its compact habit for a long time without requiring pruning. Very hardy and durable, it prefers full sun exposure and well-drained soil, while tolerating poor soils and cold climatic conditions.
Soil and care
The rightconditions.
Fertilization
Slow-release fertilizer in spring. Fertilize monthly or as directed on the bag. Not recommended – use Bionik rooter or bone meal.
Bloom and dimensions
The completeprofile.
Bloom periodNot significant
Flower colorNon-ornamental
Foliage colorBlue
Foliage typePersistent
FruitingSmall, light brown cones typical of spruce trees
Maximum height1 to 1.2 m (39 to 48 inches)
Maximum width1 m (3 feet)
Growth ratevery slow
Hardiness zoneZone 3
Minimum temperature'-40°C
