There are quite a few names for the Glaucous spruce - Canadian, blue, and white. In Russia it is often mistaken for a blue spruce. The reason is that these trees are often planted near administrative buildings and monuments, because the evergreen crown of both the Glaucous and the blue spruce looks impressive, solid and even somewhat solemn.
Peculiarities of Glauca spruce
The blue spruce (Picea glauca), or Glauca, or Canadian belongs to the genus Spruce (Picea), which is part of the Pine family. The blue spruce (Picea pungens) also belongs to the genus Spruce, but it is a larger tree, with its needles often having a deep blue color.
The Glauca spruce is a coniferous evergreen tree, with an average height ranging from 15 to 20 meters. However, there are also larger specimens that can be up to 40 meters tall. The trunk has a thin, scaly bark on its surface, but its diameter is usually no more than 100 cm. While the tree is young, its crown has a narrow conical shape, extending upwards. Over time it becomes cylindrical.
The needles feel quite prickly, their length is from 1.2 to 2 cm, has a diamond-shaped cross-section. The front surface of the needles is greenish-blue, while the underside is white.
The fruit is a cylindrical cone, which reaches about 25 mm in diameter and up to 70 mm in length. It may be colored green or pale red.
A completely dried cone is brown in color. The seeds of the black shade reach 0.2 to 0.3 cm in length. They have wings about 0.
8 cm long, a pale brown hue.
Spiny Glauca Globosa / Spruce planting and care / conifers
The Glauca spruce species with photos
Dwarf spruces are excellent for decorating rest areas and flower beds. One of the most decorative varieties is the blue spruce (Picea pungens Glauca Globosa) on a bough. This species does not exceed three meters in height and its silvery blue needles are about 15 mm long. After a while, a compact, cone-shaped crown is formed on a trunk without branches.
However, if desired, with the help of pruning, it can be given a spherical shape. Seedlings of such a tree rarely appear on sale, because it takes a comparatively long time to obtain marketable specimens (saleable).
The following will describe those varieties and varieties of spruce that are most often used for decorating parks and garden plots. They have been created by selection specifically for a variety of decorating purposes.
Globosa spruce (not Picea pungens, but Picea glauca Globosa)
A Dutch breeder bred this dwarf tree in 1937.
Typically, the maximum height of this cushion-shaped spruce is about 200 cm, with young specimens having an almost spherical crown. The annual growth is relatively small, about 100 mm. Over time, the crown acquires a conical shape. The blue-and-blue needles are about 40 mm long and have a beautiful silvery tint. The color of the needles does not fade throughout the year.
The branches are densely covered with needles making them appear fluffy.
Fir Glauca Conica (Picea glauca Conica)
This small tree is about 4 meters tall. Its branches are densely covered with soft needles. This plant is shade-loving and frost-resistant (up to minus 29 degrees). This variety is widespread in culture, and it is used to decorate a variety of shaded and sunny areas.
It is also cultivated in tubs on balconies and terraces. However, under room conditions, without a regular supply of fresh air, the tree will die.
Picea glauca Compacta (Picea glauca Compacta)
This compact plant has a broadly pyramidal, dense, high-density crown. At ten years of age, the tree is about 100 cm tall and reaches a similar size in diameter. The branches are horizontal to the trunk.
Stiff silvery blue needles grow spirally around the branches. The tree tolerates formative pruning well. It grows best in a well-lit location with well-drained, nutritious soil.
Fir Glauca procumbens (Picea glauca procumbens)
This ornamental dwarf tree has a very wide, flattened crown. This coniferous crop can easily be confused with a shrub.
At ten years of age, the tree is about half a meter tall and can reach up to 1.2 m across. However, by the age of 30, it is up to 300 cm in height. This spruce can endure frosts as low as -29 degrees below zero.
You can also find Picea pungens "Glauca Procumbens" seedlings on the market.
It is a shade-loving and drought-resistant. Very wide crown of flat-planter form at the age of ten years reaches 1.2 m across and 0.2 m in height. Short greenish-blue needles have high rigidity.
The variety is used for decorating balconies, rockeries and roofs.
Glauca Arizona (Picea glauca arizonica)
Saplings of this Canadian variety are often labeled "Glauca spruce "Kaibab" in the market. A mature tree can reach a height of 150 to 200 cm with a crown diameter of 200 to 300 cm. Compared to other varieties, it has very thick branches. The short needles are about 1.
2 cm long. The silvery blue needles are very dense and prickly. When growing in a shady area the needles change their color to dark green. The tree is light loving and drought tolerant.
Fir Glauca Ducharme (Picea glauca Ducharme)
This cultivar has a dwarf crown that is irregularly spherical in shape.
This strongly branched plant has short branches that are decorated with grayish-blue needles. At ten years of age, the plant reaches a width and height of about 0.3 m. The annual growth of the tree is less than 25 mm. This variety propagates very well from cuttings, unlike other varieties.
Picea glauca Perfecta5>
This species has a regular, symmetrical and cone-shaped crown with a distinctly pointed apex. The tree will be approximately 100cm tall when it reaches the age of 10. Over time it can grow to 400 cm. It will grow a maximum of 40mm per year.
As a rule, young needles will have a greenish tint but the colouring will become darker with time.
The needles feel relatively soft. The branches of this strongly branched tree grow vertically upwards and at an acute angle to the trunk. The variety needs plenty of light.
Spiny Lila Spruce (Picea pungens Lila)
This highly ornamental variety looks like a flowering shrub. The delicately glossy, glaucous needles are highly dense.
In the last summer weeks the plant forms red-raspberry cones that are 10 to 15 centimeters long. The crown is asymmetrical. The annual growth is about 100 mm. Due to this the tree reaches a maximum height of 100 cm in ten years. This light-loving plant grows best on sandy loam and sandy soil.
It reacts negatively to lime in the soil and to standing water in the roots.
Spruce Common Virgata (Picea abies Virgata)
This species has an unusual appearance and somewhat resembles a fairy tree. The adult plant is 6 to 8 meters tall. The tree is young and grows quickly, growing about 0.4 m a year.
The cone-shaped crown consists of very long, serpentine branches, which fall and horizontal branches, which are weakly branched. The branches point upwards at the top of the crown. Buds are only formed at the top of the shoots. Dark green thick pointed needles up to 20 mm long. The color of young growth is greenish.
The variety is characterized by high humidity, it needs high air humidity.
Sorts of Spruce Spruce. Coniferous plants.
In nature, the Canadian spruce is most widely distributed in northern North America. Here it is found over a wide area from northern Montana to northern Alaska.
Nowadays cultivated varieties with spectacular needles are very popular in European countries. They are often planted in private gardens and public parks.
Planning and care
The Glaucus spruce is best planted outdoors in mid-spring. However, it can also be done in the last days of August. A distance of at least 200 cm should be kept between the planting holes, even for dwarf varieties.
The fact is that this plant reacts negatively to overgrowth. When inspecting seedlings that are three to six years old, you should pay attention to the fact that they should not be damaged, and on the root system - signs of rotting.
The depth and width of pits for planting should be about 0.6 m. At the bottom you should make a drainage layer about 15 centimeters thick, for this you can use fine gravel or broken ceramics.
When preparing the planting hole, the soil should be set aside, and then combine it with peat and humus. Seedlings are planted so that the root neck was at the same level as the soil. After planting, the planting circle should be mulched with sand, peat, crushed bark or needles, because Glauca spruce does not respond well to too much compaction of the soil. Planted seedlings should be abundantly watered: 2 buckets of water under one plant.
The Glauca spruce does not need any special care.
Additional watering is required only for those varieties that are moisture-loving. Other varieties are quite enough of natural precipitation. Since the annual growth of dwarf varieties is only a few centimeters, they do not need regular feedings. If a nutritious soil was used to fill the hole when planting the tree, then the first time the plant is fertilized only after 2 or 3 years. Subsequently, a mineral complex for coniferous crops should be used.
SEAKING A BIG Fir. How to plant blue spruce
Propagation of Glauca spruce in nurseries is done in 3 ways: by cuttings, seed and grafting. By grafting, breeders are able to get the most spectacular varieties of blue spruce on a stem or Glaucous spruce. However, only specialists can do grafting correctly, and even they regularly lose some of the planting material.
Seeds are collected in the autumn, using fully mature cones.
They are then stratified for two months. The seeds are then sown in peat to a depth of about 20mm. The seeds are placed in a mini-greenhouse and given plenty of light. When the first seedlings appear, the cover should be removed. After that, they are further cultivated in the greenhouse for three years.
After that, the seedling can be transplanted to a permanent place.
For the preparation of cuttings, choose a plant that is more than eight years old. For this purpose, the tops of the shoots are cut off with a piece of bark, and the length of the piece should be about 10 centimeters. The lower part of the cuttings is treated with a product that stimulates root growth, and then it is planted in a substrate of peat, sand and perlite. Next, the planting is removed into a mini greenhouse, located in the penumbra and in the warmth.
After the roots grow, the seedling is left in the greenhouse for another 4 years. Then it is planted in a permanent place.
MEMBERSHIP OF BLUE FIRES. The easiest but effective way to propagate a blue spruce by cuttings .
Diseases and pests
The Glauca spruce is quite resistant to pests and diseases.
However, if the site is poorly ventilated, in rainy weather, or when moisture is stagnant in the soil, the plant may be affected by fungal disease: brown schutte, fusarium. It is necessary to treat the tree as soon as possible with a fungicide preparation, for example, Fundazol, Topaz, etc.
For this culture, the greatest danger is the gall and spruce aphids, spider mite and leafminer. Acaricidal and insecticidal agents are used to control them, for example: Confidor, Actara, Fitoverm. To achieve results, you will need several treatments with the drug with a break of 1 week.
For preventive purposes, at the beginning of the spring period, the tree is treated with a 1% Bordeaux mixture.
Application and value
Glauca spruce is excellent for growing in urban conditions as it is not affected by industrial emissions and car exhaust air. But it is highly decorative. This plant is often used for planting near fences as a barrier, and it is also planted between fruit bushes and trees in a staggered order. The crown has a high density and the ability to retain most of the dust, which can be washed away with water from a hose or wait for rain.
In addition, such a conifer fills the air around it with useful phytoncides.
Application in landscape design
The Glauca spruce is very often used for decorating rockeries and alpinaries by planting it between large stones and other conifers. The dwarf varieties in tubs and containers can be planted in porches, terraces, balconies and any open space.
Glauka also looks very well when planted alone in the middle of a flower bed or on a lawn. Suitable for hedge creation near fence or house and very dense.
Spruce on a bough can decorate any garden plot, arbor or recreation area.
Forming the crown of blue spruce. Beautiful and well-groomed conifers