Iseli Columnar Colorado Spruce
Picea pungens ‘Iseli Fastigiate‘
Other Names: Iseli Fastigiate Blue Spruce
Plant Details
USDA Plant Hardiness Zones: 3a-7b in hot summer climates; 3a-8b in cool summer climates  Find Your Zone
Plant Type:Â Coniferous Evergreen Tree
Height at Maturity:Â 20-25’+, depending on location. Possibly 40′ when growing in ideal conditions
Width at Maturity:Â 4-6’+, depending on location. Possibly 8′ when growing in ideal conditions
Spacing:Â Â Best as specimen, in spaced groupings at 8′ apart, or use two to frame an entrance
Growth Habit / Form:Â Upright, Narrow, Column
Growth Rate:Â Slow, 8-12″ per year
Foliage Color:Â Light Silvery Blue new growth matures to Steel-Blue
Fragrant Foliage:Â Yes
Sun Needs:Â Full Sun or Mostly Sun
Water Needs:Â Â Average, low when established
Soil Type:Â Â Clay (amend heavy clay to ensure good drainage), Loam, Sand, SiltÂ
Soil Drainage:Â Moist to Damp But Well-Drained
Soil pH:Â 6.0 – 7.5
Maintenance / Care:Â Very Low
Attracts:Â Visual Attention
Resistances:Â Cold (-40F), Deer, Disease, Drought (when established), Insect
Description
Have you always loved the Colorado Blue Spruce but lacked the space to accommodate a large tree? That’s all changed with the introduction of Picea pungens ‘Iseli Fastigiate,’ commonly called Iseli Columnar Blue Spruce. A sentinel in the landscape with the form of a fat cigar, its average mature size in home gardens is 20 to 25 feet tall and 4-6 feet wide, depending on location and elevation. It tends to grow shorter at higher elevations and taller at lower elevations. Extremely low-maintenance and easy to grow, the Iseli Columnar Blue Spruce is a beautiful accent for adding dynamic color, texture, and form where space might be limited in landscape borders, home foundation plantings, and rock and conifer gardens. Two can frame an entrance, or a spaced grouping of three is nice in larger spaces.
Landscape & Garden Uses
The Iseli Columnar Colorado Blue Spruce is ideal as an accent tree in smaller landscape or garden spaces where height is desired but space is limited. It is also excellent for framing entryways or corners in home foundation plantings or spaced groupings with trees 7 feet apart or more in larger landscape and garden spaces. It is also lovely in pots, planters, and other containers for situating on or around sunny patios and other outdoor sitting and living spaces. It is a fine addition to conifer gardens, rock gardens, blue-theme gardens, Zen gardens, and the Xeriscape.
Suggested Spacing:Â 7 feet or more apart in spaced groupings
Growing Preferences
The Iseli Columnar Colorado Blue Spruce is easy to grow in damp to moist but well-drained soil of average fertility. As with many other conifers, constantly soggy or wet soils can be problematic, leading to root rot or other harmful plant diseases. So make sure to plant it in well-drained soil, whether in the ground or pots. It grows best in full sun; however, in hot summer climates of Zones 7 and 8 in the south, it will prefer some filtered sun during the middle of the afternoon. Once established, water needs are lower when growing in the ground. In pots, soil moisture must be monitored more closely, especially during summer. When the top two inches of soil is dry, provide water.
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