White spruce
Picea glauca · Pinaceae
📷 dmcdevit · CC BY-SA 2.0
The gardener's calendar
In autumn, ease off feeding and take the chance to clean up around white spruce and prepare for winter.
ID card
- Foliage
- Evergreen (blue-green needles)
- Mature size
- 20 m tall × 5 to 7 m wide
- Growth rate
- Moderate to fast
- Hardiness
- Very hardy (down to -40 °C)
- Origin
- North America (Canada and northern United States)
- Soil type
- Acidic to neutral, well-drained soils
- Flowering
- Discreet cones in spring
✓ Taxonomy verifiedSource: AI estimate · hardiness: reliability high.
Expert tips
The key tip
White spruce dreads root asphyxiation: drain imperatively with a gentle slope and verify that winter snowmelt doesn't stagnate at the collar. Even a single prolonged excess of moisture can rot the roots, even in a hardy tree.
The common mistake
Planting in compacted or clayey soil without draining amendment; most fail due to insufficient soil porosity.
The pro's trick
At planting, thoroughly break up the root ball and incorporate river sand or fine gravel up to 30 cm deep.
Care
Exposure and light
White spruce prefers full sun exposure for optimal growth. It tolerates partial shade but fills out better with at least 6 hours of direct sunlight daily. Avoid overly windy exposures that can dry out the foliage.
Watering
Water regularly during the first year after planting to promote root establishment. Once established, white spruce is very tolerant of relative drought. Watering during prolonged heat waves (every 10-15 days) is generally sufficient.
Soil and drainage
Plant in slightly acidic to neutral, well-drained soil rich in organic matter. White spruce dislikes permanent waterlogging and compact chalky soils. Enrich the planting hole with peat or compost.
Pruning and trimming
Pruning is not essential: white spruce naturally adopts an elegant conical shape. Remove only dead or poorly positioned branches in late winter. Avoid cutting the top to preserve its leading shoot.
Fertilization
An established plant generally doesn't require regular fertilizer. Apply decomposed compost on the surface each autumn, or balanced conifer fertilizer in spring if growth seems slow.
Pests and diseases
White spruce is robust but can be affected by spider mites in very dry, hot climates. Conifer scale insects and aphids are possible in favorable conditions. Good drainage prevents root rot.
Did you know?
White spruce has been Canada's national tree since 1961 and appears on the Yukon flag. It is also the preferred wood in lutherie for making concert piano soundboards, thanks to its exceptional acoustic properties.
Where to buy it
Best planted in autumn so the roots settle in before summer, or in early spring once the frost has passed. Pick a plant with healthy foliage and roots that are not exposed. Best time: March, October, November.
Add this plant to my garden →Plants from the same family
- Norway sprucePicea abies
- Aleppo PinePinus halepensis
- Stone PinePinus pinea
- Silver firAbies alba
- European larchLarix decidua
- Austrian black pinePinus nigra
Tips generated and checked by Viridia — adapt them to your local climate.