Picea glauca Sanders Blue - White Spruce
Picea glauca Sanders Blue - White Spruce
Picea glauca Sander's Blue
White Spruce, Canadian Spruce, Skunk Spruce, Cat Spruce, Black Hills Spruce, Western White Spruce, Alberta White Spruce, Porsild Spruce
Why does half of the plant tend to be brown and the other blue? What should I do? Response from Promesse de Fleurs: You can send me a photo to diagnose what your young plant is suffering from.
Olga, 29/03/2016
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Description
Picea glauca Sander's Blue is a dwarf form of white spruce. This evergreen plant gradually forms a narrow, conical bush, covered with dense and regular vegetation. Its young metallic blue-grey shoots emerge in spring, smothering the old green-blue foliage. Its foliage is composed of fine, short, and dense needles. It has a slow growth rate. It is perfect for rockeries, flower beds, and pots. It is a small, hardy conifer that appreciates the sun and ordinary, moist soil.
Picea glauca, also known as White Spruce or Glaucous Spruce, is an evergreen conifer belonging to the Pinaceae family, native to Canada. In its natural environment, it grows slowly. Its growth habit depends on its habitat, but it is usually conical or pyramid-shaped with a broad base. This tree can reach a height of 25m (82ft). This species is traditionally used for paper-making. It can live for many years (200 years and more).
The 'Sander's Blue' variety, derived from this species, is often assimilated to the 'Conica Blue' variety, derived from 'Conica'. It is an elegant small conifer with a compact, conical, narrow, and upright habit. The dense vegetation gives it a well-groomed topiary appearance without the need for pruning. Its growth is very slow. After 20 years, it will reach a height of 1m (3ft) with a width of 40cm (16in), sometimes a little more in cool and humid climates. When mature, it will reach a height of 3m (10ft) and a width of 1.5m (5ft) at the base. It produces short, very dense, staggered, and highly hierarchical branches, covered with short, quadrangular needles arranged in brushes, which are very sharp and aromatic (acrid resin smell). They are covered with a white wax. Its spring shoots are a very bright steel blue, then its foliage takes on a uniformly blue-green colour, variable depending on the plants. Its root system is shallow, highly branched, and creeping, which makes it difficult to transplant when mature and particularly sensitive to wind.
With its perfect habit, limited growth, undemanding nature, and easy cultivation, it is perfect for rockeries, terraces, or for isolated planting. It thrives in many situations, under various climates, as long as the soil is moist, well-drained, and not too chalky. This plant goes well with large stones, geometric lines, and masonry works. It can be planted with other conifers whose sculptural qualities naturally suit the design of a contemporary garden. With their reassuring permanence, these plants durably structure a bed. They can mark pathways, and border terraces, easily replacing the strong presence of trimmed boxwood or holly. They pair well with heathers or ground cover plants such as aubrietas, cerastiums, shrubby salvias, as well as flowering shrubs. The key is to play with volumes and colours.
Picea glauca Sanders Blue - White Spruce in pictures
Plant habit
Foliage
Botanical data
Picea
glauca
Sander's Blue
Pinaceae
White Spruce, Canadian Spruce, Skunk Spruce, Cat Spruce, Black Hills Spruce, Western White Spruce, Alberta White Spruce, Porsild Spruce
Cultivar or hybrid
Planting and care
Plant from September to November and from February to June in deep, well-drained, light, rather neutral, moist to dry soil. A sandy, loamy or gravelly soil, not too chalky, will be perfectly suitable. Choose a sunny or semi-shady location, sheltered from prevailing winds. In too sunny and dry conditions, it will be more susceptible to attacks from red spider mites. Soak the root balls well before planting. Add organic matter at planting and water generously in the first few years, and in case of prolonged drought. Apply a special conifer fertiliser every year in April and weed the soil in summer. This extremely hardy conifer cannot tolerate heavy, waterlogged soils in winter. Pruning is not necessary, as this pyramid-shaped plant reveals its full potential when allowed to grow freely.
Planting period
Intended location
Care
Planting & care advice
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Hardiness is the lowest winter temperature a plant can endure without suffering serious damage or even dying. However, hardiness is affected by location (a sheltered area, such as a patio), protection (winter cover) and soil type (hardiness is improved by well-drained soil).
The flowering period indicated on our website applies to countries and regions located in USDA zone 8 (France, the United Kingdom, Ireland, the Netherlands, etc.)
It will vary according to where you live:- In zones 9 to 10 (Italy, Spain, Greece, etc.), flowering will occur about 2 to 4 weeks earlier.
- In zones 6 to 7 (Germany, Poland, Slovenia, and lower mountainous regions), flowering will be delayed by 2 to 3 weeks.
- In zone 5 (Central Europe, Scandinavia), blooming will be delayed by 3 to 5 weeks.
In temperate climates, pruning of spring-flowering shrubs (forsythia, spireas, etc.) should be done just after flowering.
Pruning of summer-flowering shrubs (Indian Lilac, Perovskia, etc.) can be done in winter or spring.
In cold regions as well as with frost-sensitive plants, avoid pruning too early when severe frosts may still occur.
The planting period indicated on our website applies to countries and regions located in USDA zone 8 (France, United Kingdom, Ireland, Netherlands).
It will vary according to where you live:
- In Mediterranean zones (Marseille, Madrid, Milan, etc.), autumn and winter are the best planting periods.
- In continental zones (Strasbourg, Munich, Vienna, etc.), delay planting by 2 to 3 weeks in spring and bring it forward by 2 to 4 weeks in autumn.
- In mountainous regions (the Alps, Pyrenees, Carpathians, etc.), it is best to plant in late spring (May-June) or late summer (August-September).
The harvesting period indicated on our website applies to countries and regions in USDA zone 8 (France, England, Ireland, the Netherlands).
In colder areas (Scandinavia, Poland, Austria...) fruit and vegetable harvests are likely to be delayed by 3-4 weeks.
In warmer areas (Italy, Spain, Greece, etc.), harvesting will probably take place earlier, depending on weather conditions.
The sowing periods indicated on our website apply to countries and regions within USDA Zone 8 (France, UK, Ireland, Netherlands).
In colder areas (Scandinavia, Poland, Austria...), delay any outdoor sowing by 3-4 weeks, or sow under glass.
In warmer climes (Italy, Spain, Greece, etc.), bring outdoor sowing forward by a few weeks.
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