Blue Swiss Stone Pine
Pinus cembra ‘Glauca’Â
Other Names:Â Arolla Pine, Swiss Pine, Austrian Stone Pine
Plant Details
USDA Plant Hardiness Zones:Â 3a-7b (8 in cool summer or mild climates)Â Â Find Your Zone
Plant Type:Â Coniferous Evergreen Tree
Height at Maturity:Â 15-20′ on average
Width at Maturity:Â 10-15′ at its base
Spacing:Â Â Best as a specimen or small groupings; 16′ apart for space between trees
Growth Habit / Form:Â Upright, Pyramidal
Growth Rate:Â Slow: 8-12″ per year
Flower Color:Â –
Flower Size:Â Â –
Flowering Period:Â –
Flower Type:Â –
Fragrant Flowers:Â Â –
Foliage Color:Â Dark Green in summer, turning Golden-Yellow during the winter
Fragrant Foliage:Â Yes
Cones:Â Â Yes
Cone Color:Â Purple to Brown
Sun Needs:Â Full Sun or Mostly Sun (6 hours minimum per day)
Water Needs:Â Â Average, Low when established
Soil Type:Â Â Clay (Amend heavy clay to ensure good drainage), Loam, Sandy, Silty
Soil Moisture / Drainage:Â Moist But Well-Drained to Dry when established
Soil pH:Â 5.0 – 7.0 (Acid to Neutral)
Maintenance / Care:Â Very Low
Attracts:Â Visual Attention
Resistances:Â Cold Temperatures (-40F), Deer, Drought (when established)
Description
Pinus cembra ‘Glauca’ is a blue version of the Swiss Stone Pine, characterized by attractive, soft-textured, long, silvery blue to blue-green needles providing a soothing color for the landscape. A slow grower adding 9 to 12 inches in height per year, it forms an upright pyramid 15 to 20 feet tall and 10 to 15 feet wide or so at its base when all grown up, which makes it a fine specimen or outdoor Christmas tree in medium-sized landscape spaces and large containers, groupings where space allows, or to frame the corners of homes and other buildings. Being that Swiss Stone Pines are native to central Europe, from the Alps to the Carpathians, they are cold-hardy to USDA Zone 3, where temperatures can drop to -40°F, and heat-hardy to Zone 7b. Some sources say Zone 8, but we’d rather be safe than sorry. If you’re in Zone 8, where summers are hot, and would like to try this pine, we suggest providing some filtered sun or shade during the mid-afternoon hours. A very hardy and attractive coniferous evergreen, the Golden Swiss Stone Pine is easy to grow and exceptionally low maintenance, and we’ve seen no problems with insects or disease. No pruning is necessary to keep its dense form.
Landscape & Garden Uses
Growing 15 to 20 feet tall and 10 to 15 feet wide at maturity, the Blue Swiss Stone Pine is an ideal specimen for medium-sized landscape spaces or for use in pots, planters, and other containers. It makes for a fine outdoor Christmas tree and can be grouped where space allows, and can also be used to frame the corners of tall homes and other buildings It grows tall enough to be considered a candidate for a privacy screen, but will take some patience as the tree only adds 8 to 12 inches in height per year. It is a fine addition to rock gardens, conifer gardens, blue-themed gardens, and Asian theme gardens.
Suggested Spacing:Â Â Best as a specimen or in spaced groupings at 16 or more feet apart
Growing Preferences
The Blue Swiss Stone Pine is easy to grow in most any moist but well-drained soil of average to low fertility and full to mostly sun, preferably 6 hours or more direct sunlight per day. Young trees will require some moisture to develop a sound root system; however, established trees are drought-tolerant. Does not like a constantly soggy or wet soil. It likes cool summer climates, so we advise not planting further south than USDA Zone 7b where summers are hot.
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