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Furthermore, this species is more resistant to high insolation and frost damage compared to other associated species. But the wood from the trees also serves as an important raw material for building supplies and in the paper industry. Early people used their wood for building. [35], Blue spruce usually grows in cool and humid climatic zones where the annual precipitation mainly occurs in the summer. Spruce wood offers an even texture that makes it appealing as a building material. [12][13] Another insect pest is the spruce beetle (Dendroctonus rufipennis) which bores under the bark. The annual average temperature ranges from 3.9 to 6.1 degrees C (39 to 43 degrees F). [18] Five years before transplanting, the total root surface area of 2-meter-high trees was doubled by pruning the roots of blue spruce. [9], The blue spruce is the State Tree of Colorado. This liquid is also used externally for rheumatic pains. Appearance: The spruce wood appear to be bright in color. It often first attacks trees which have blown over by the wind and when the larvae mature two years afterwards, a major outbreak occurs and vast numbers of beetles attack nearby standing trees. The spruce tree, part of the Picea genus, is a classic evergreen conifer option for your landscape. Nevertheless, this species can withstand drought better than any other spruce. Meanwhile, patches of white resin appear on the bark and the branch eventually dies. In traditional medicine, an infusion of the needles is used to treat colds and settle the stomach. And ranges from - 3.9 to - 2.8 degrees C (25 to 27 degrees F) in January. Various rust diseases also affect the tree causing yellowing of the needles as well as needle fall. My house is built with 2x4 wall studs and 2x10 floor joists. The larva of the spruce budworm eat the buds and growing shoots while the spruce needle miner hollows out the needles and makes them coalesce in a webbed mass. The many uses of the spruce tree make it a versatile option. It also increases the root concentration in drip irrigation pipeline from 40% to 60%, which is an advantage in landscape greening. In July, the average temperature ranges from 13.9 to 15.0 degrees C (57 to 59 degrees F). Early people used their wood for building. [5][6][7][8], The specific epithet pungens means "sharply pointed", referring to the leaves. [31], Blue spruce generally exists on gentle uplands and sub irrigated slopes, in well-watered tributary drainage, extending down intermittent streams, and on lower northerly slopes. The Navajo and Keres Native Americans used this tree as a traditional medicinal plant and a ceremonial item, and twigs are given as gifts to bring good fortune. The blue spruce has blue-green coloured needles and is a coniferous tree. The pale brown cones are up to 10 cm (4 in) long. [6][7][11] It is also grown for the Christmas tree industry. And fifth percent of the annual precipitation occurs during the growing season of the plants. In the wild, Picea pungens grows to about 23 m (75 ft), but when planted in parks and gardens it seldom exceeds 15 m (49 ft) tall by 5 m (16 ft) wide. The blue spruce, green spruce,[2] white spruce,[3] Colorado spruce, or Colorado blue spruce, with the Latin (scientific) name Picea pungens, is a species of spruce tree. It is a columnar or conical evergreen conifer with densely growing horizontal branches. [14], The blue spruce is susceptible to several needle casting diseases which cause the needles to turn yellow, mottled or brown before they fall off. [10], Picea pungens and its many cultivars are often grown as ornamental trees in gardens and parks. Strong, straight trunks and tiers of dense branches make these trees a beautiful addition. [6], The blue spruce is attacked by two species of Adelges, an aphid-like insect that causes galls to form. And, to add to Robert’s answer, the fronts of violins. [36], 10.2305/IUCN.UK.2013-1.RLTS.T42333A2973433.en, "Spruce Beetle Threatens High Country Spruce Forests", Fine Gardening Plant Guide: Picea pungens ‘Glauca Pendula', Conifers.org: Picea pungens (blue spruce) description, https://en.wikipedia.org/w/index.php?title=Blue_spruce&oldid=982512701, Plants used in traditional Native American medicine, Creative Commons Attribution-ShareAlike License, 'Fat Albert' – compact perfect cone to 10 feet (3.0 m) of a silver blue color, 'Glauca Jean's Dilly' – shrub from 3–6 feet (0.91–1.83 m) in height, 'Glauca Pendula' – drooping branches, spreads to about 8 feet (2.4 m) wide by 4 feet (1.2 m) tall, This page was last edited on 8 October 2020, at 16:30. The average minimum temperature in January ranges from - 11.1 to 8.9 degrees C (12 to 16 degrees F), and the average maximum temperature in July ranges from 21.1 to 22.2 C (70 to 72 degrees F). The wood has little commercial value, but is used for construction and is also valued for its use in the pulp industry to make paper. The first symptom is the needles turning reddish-brown and falling off. Waxy gray-green leaves, up to 3 cm (1 in) long, are arranged radially on the shoots which curve upwards. Other uses of Blue Spruce: A fairly wind resistant tree, it can be grown as part of a shelterbelt planting. [36], Blue spruce is most common in Colorado and the Southwest. Wood - light, soft, close grained, weak, brittle and often full of knots. There is a frost-free period of about 55 to 60 days from June to August. [19], Common cultivars (those marked .mw-parser-output span.smallcaps{font-variant:small-caps}.mw-parser-output span.smallcaps-smaller{font-size:85%}agm have gained the Royal Horticultural Society's Award of Garden Merit):[20], The Navajo and Keres Native Americans used this tree as a traditional medicinal plant and a ceremonial item, and twigs are given as gifts to bring good fortune. Winter is the season with the poorest rainfall, the precipitation is usually less than 20 percent of the annual moisture falling from December to March. [40] It can withstand extremely low temperatures (-40 degrees C) as well. This liquid is also used externally for rheumatic pains. It is native to North America, and is found in growing zones 1 through 7. [32], Blue spruce always grow naturally in the soils which are in the order Mollisols, and the soil will also be in the orders histosols and inceptisols in a lesser extent. [12], Blue spruce seedlings are shallow roots that penetrate only 6.4 cm (2.5 inches) of soil during the first year. With the span of time the color of the spruce wood changes to reddish-white and the wood darken to yellow-brown. Nymphs of the pineapple gall adelgid form galls at the base of twigs which resemble miniature pineapples and those of the Cooley's spruce gall adelgid cause cone-shaped galls at the tips of branches. Mites can also infest the blue spruce, especially in a dry summer, causing yellowing of the oldest needles. Shadows in late spring and early autumn minimize this frost heaving loss. Propagation of the herb: [16][17] Despite the shallow roots, blue spruce is able to resist strong winds. [37][38], Annual mean precipitation generally vary from 460 to 610 mm (18 to 24 in). An elongated white scale insect, the pine needle scale feeds on the needles causing fluffy white patches on the twigs and aphids also suck sap from the needles and may cause them to fall and possibly dieback. [15] Although freezing can't damage much in blue spruce, frost will cause seedling loss. Affordable: The spruce wood is available in market at low rates due to this reason the spruce wood is one of the popular material which is used for making the furniture. It has scaly grey bark on the trunk with yellowish-brown branches. [32][33][34], Blue spruce is considered as a pioneer tree species in moist soil in Utah. In traditional medicine, an infusion of the needles is used to treat colds and settle the stomach. Canker caused by Cytospora attacks one of the lower branches first and progressively makes its way higher up the tree. [37][39], Blue spruce is generally considered to grow best with abundant moisture. 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