PlantFiles is getting a new look! Just in time for spring, we're rolling out a new look for the best online plants database. It will also work with your smart phones and mobile devices, so now you can take it with you on garden center visits or botanical garden tours. Questions or comments? Please post them here.

Colorado Spruce, Blue Spruce
Picea pungens 'St. Mary's Broom'

Family: Pinaceae (py-NAY-see-ee) (Info)
Genus: Picea (PY-see-uh) (Info)
Species: pungens (PUN-gens) (Info)
Cultivar: St. Mary's Broom

Category:

Conifers

Height:

18-24 in. (45-60 cm)

Spacing:

24-36 in. (60-90 cm)

Hardiness:

USDA Zone 3a: to -39.9 C (-40 F)

USDA Zone 3b: to -37.2 C (-35 F)

USDA Zone 4a: to -34.4 C (-30 F)

USDA Zone 4b: to -31.6 C (-25 F)

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

Sun to Partial Shade

Danger:

Handling plant may cause skin irritation or allergic reaction

Bloom Color:

Inconspicuous/none

Bloom Time:

N/A

Foliage:

Grown for foliage

Evergreen

Blue-Green

Other details:

Average Water Needs; Water regularly; do not overwater

Provides winter interest

Soil pH requirements:

5.1 to 5.5 (strongly acidic)

5.6 to 6.0 (acidic)

6.1 to 6.5 (mildly acidic)

6.6 to 7.5 (neutral)

7.6 to 7.8 (mildly alkaline)

Patent Information:

Unknown - Tell us

Propagation Methods:

By grafting

Seed Collecting:

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

Regional

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

Rock Island, Illinois

Minneapolis, Minnesota

Belfield, North Dakota

Cincinnati, Ohio

Gardeners' Notes:

2
positives
0
neutrals
0
negatives
RatingContent
Positive

On Mar 12, 2006, conifers from Rock Island, IL (Zone 5b) wrote:

A very beautiful Miniature selection of Colorado Blue Spruce growing about 1" per year. Plant is globose but with age becomes more spreading than upright. It is said that a 20+ year-old specimen of this cultivar is likely to die for no sudden reason. A marvelous plant, nonetheless.

Positive

On Mar 4, 2004, Todd_Boland from St. John's, NL (Zone 5b) wrote:

A lovely dwarf blue spruce. This cultivar arose as a witch's broom on 'Mongomery', itself a dwarf blue spruce. The blue needles provide year-round interest.