Botanical profile

Picea pungens 'St. Mary's Broom'

Latin name
Picea pungens 'St. Mary's Broom'
Common name
Colorado Blue Spruce 'St. Mary's Broom'
Type
Coniferous
Family
Pinaceae

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.

Care guide

Growing conditions

Light, soil, water and hardiness

Hardiness zone
Zone 3
Exposure
Sun
Watering
Moderate watering
Fertilization
Slow-release fertilizer in spring. Fertilize monthly or as directed on the bag. Not recommended – use Bionik rooter or bone meal.
Soil type
Acidic to slightly acidic, well drained
Minimum temperature
'-40°C
Plant appearance

Blooming, foliage and shape

Blooming period
Not significant
Flower color
Non-ornamental
Fruiting
Small, light brown cones typical of spruce trees
Foliage color
Blue
Foliage type
Persistent
Shape
Dwarf
Garden structure

Size and growth

Height
1 to 1.2 m (39 to 48 inches)
Width
1 m (3 feet)
Growth rate
very slow
Pet friendly
Safe for pets

Pets

Deer
Less attractive or generally tolerated by deer

Deer

The availability of our plants varies depending on arrivals, seasons, nursery production and supplier availability. Some varieties may be offered for a limited time only, depending on their natural cycle or current stock. These plant profiles are designed to guide and inspire you when choosing plants for the garden, landscaping projects, containers or long-lasting outdoor arrangements.