Picea pungens 'Koster' – Picea pungens 'Koster'

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Pinaceae

Picea pungens 'Koster' – Picea pungens 'Koster'

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Old cultivar of Picea pungens with needles a striking bluish grey colour. This colour is less intense than the colour of the needles of the more recent cultivar 'Hoopsii'. It becomes a broad, pyramidal tree with more or less horizontal branching arranged close together. The tree can grow to approx. 10 - 15 m in height and remains about 5 m in width. In its juvenile stage, it often doesn't have a main trunk that grows vertically, rendering support necessary. As it matures, it grows uniformly. The trunk is greyish brown and later greyish black and deeply scaled. The twigs have no hair and are orange-brown. The intensely silvery blue colour of the stiff, very pointy, closely grouped needles is striking. Its long, cylindrical cones are green at first and turn yellowish brown as they ripen. Makes little demands when it comes to soil type but does require a sunny site. Tolerates more dryness than other spruces.

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Specifications
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Height
10 - 15 m
Crown
narrow pyramidal, dark, dense crown
Bark and branches
bark greyish black, scaled, twigs glossy orange-brown
Leaf
stiff, pointy needles, silvery blue, 2 - 3 cm, evergreen
Flowers
unremarkable
Fruits
hanging, cylindrical cones, 4 - 10 cm long
Spines/thorns
None
Toxicity
usually not toxic to people, (large) pets and livestock
Soil type
nutrient-rich, moisture-retentive, preferably not too acidic
Soil moisture
suitable for dry soil
Paving
tolerates no paving
Winter hardiness zone
4 (-34,4 to -28,9 °C)
Wind resistance
moderate
Other resistances
resistant to frost (WH 1 - 6)
Fauna tree
provides food for birds
Application
tree containers, roof gardens, industrial areas
Shape
specimen conifer
Origin
A. Koster, Boskoop, Netherlands, 1880
Specimen conifer acid soil calcareous soil clay soil loamy soil sandy soil tolerates no paving light-loving resistant to frost (WH 1 - 6) suitable for shadow suitable for dry soil narrow conical 1st size , taller than 12 metres dense crown bluegreen greygreen average growing provides food for birds non-toxic (usually) Fructe ornamentale
Frequently asked questions
Picea pungens 'Koster'

Picea pungens 'Koster' can eventually reach a height of 10 - 15 m, depending on the site and climate conditions.

Picea pungens 'Koster' has a average growing and can eventually reach a height of 10 - 15 m, depending on the site and climate conditions.

The right time to plant Picea pungens 'Koster' is during the dormancy period. In Western Europe, Picea pungens 'Koster' with root balls can generally be planted from mid-November to late April, although this depends strongly on the climatic conditions and the species of tree.

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