Blue arrow juniper pruning

Upright Juniper Pruning: Pruning An Upright Juniper Shrub

Upright junipers are tall, hardy and slender shrubs to small trees that make a real statement in a landscape. But left to its own devices, a juniper can become lanky. Pruning an upright juniper is essential to keep it looking its best. If you are wondering how to prune an upright juniper or have other questions about upright juniper pruning, read on.

Upright Juniper Pruning

Upright junipers are tall, shrubs/trees that are described as columnar in a landscape setting. They work well in garden spots that are narrow but where a plant with height is needed.

When you start pruning an upright juniper, one intent is to keep it narrow and dense. As the branches grow, they can become heavy and pull away from the trunk. This causes the tree to look disheveled, rather than tight and neat.

Upright juniper pruning can help

a shrub that is losing its shape. You’ll need to start selectively pruning a juniper bush by trimming back each branch’s terminal tip. This will reduce the length and weight of the branch, making it less likely to pull out from the trunk. You can also use an arbor tie to attach sagging branches to the central trunk.

Training an Upright Juniper

Training an upright juniper is another term for pruning the tree when it is young. If you start training an upright juniper early, the tree can grace your garden for years.

When to start pruning a juniper bush? Get out the pruners in early spring. Pruning an upright juniper at this time of year gives the tree’s branches time to regrow over the summer season. Spring is also a great time to clip out juniper branches injured in winter weather.

How to Prune an Upright Juniper

Start by taking out dead and dying braches. Remove these at the branch junction. This selective thinning also leaves the upright juniper looking natural and open. Continue pruning a juniper bush until you have removed all broken, diseased, injured or dead branches.

Take out interior branches that have become shaded by other growth. Without sunlight, these branches will die anyway, so it is better to remove them.

If you are wondering how to prune an upright juniper when branches cross, you’ll want to prune out one of them. This eliminates the rubbing action. Crossing branches can block air circulation and block out sunlight, conditions that can lead to spread of diseases.

Blue Arrow Juniper

Blue Arrow Juniper

(Photo courtesy of NetPS Plant Finder)

Height: 12 feet

Spread: 24 inches

Sunlight:

Hardiness Zone: 3b

Other Names: Colorado Redcedar

Description:

An extremely narrow and upright small evergreen tree, with showy powdery blue foliage and blue berries; adaptable to dry soils, but needs full sun; excellent for color, articulation or screening, makes a curious, almost formal tall evergreen hedge

Ornamental Features

Blue Arrow Juniper has attractive blue foliage. The scale-like leaves are highly ornamental and remain blue throughout the winter. It produces silvery blue berries from late spring to late winter. The flowers are not ornamentally significant.

Landscape Attributes

Blue Arrow Juniper is a dense multi-stemmed evergreen shrub with a narrowly upright and columnar growth habit. It lends an extremely fine and delicate texture to the landscape composition which can make it a great accent feature on this basis alone.

This is a relatively low maintenance shrub, and is best pruned in late winter once the threat of extreme cold has passed. Deer don’t particularly care for this plant and will usually leave it alone in favor of tastier treats. It has no significant negative characteristics.

Blue Arrow Juniper is recommended for the following landscape applications;

  • Accent
  • Vertical Accent
  • Hedges/Screening
  • General Garden Use

Planting & Growing

Blue Arrow Juniper will grow to be about 12 feet tall at maturity, with a spread of 24 inches. It has a low canopy, and is suitable for planting under power lines. It grows at a medium rate, and under ideal conditions can be expected to live for 70 years or more.

This shrub should only be grown in full sunlight. It is very adaptable to both dry and moist growing conditions, but will not tolerate any standing water. It is considered to be drought-tolerant, and thus makes an ideal choice for xeriscaping or the moisture-conserving landscape. It is not particular as to soil type or pH. It is highly tolerant of urban pollution and will even thrive in inner city environments. This is a selection of a native North American species.

Blue Arrow Juniper

Blue Arrow Juniper

(Photo courtesy of NetPS Plant Finder)

Height: 15 feet

Spread: 4 feet

Sunlight:

Hardiness Zone: 4a

Other Names: Colorado Red Cedar

Description:

An extremely narrow and upright small evergreen tree, with showy powdery-blue foliage and blue berries; adaptable to dry soils, but needs full sun; excellent for color, articulation or screening, makes a curious, almost formal tall evergreen hedge

Ornamental Features

Blue Arrow Juniper has attractive blue foliage. The scale-like leaves are highly ornamental and remain blue throughout the winter. It produces silvery blue berries from late spring to late winter. The flowers are not ornamentally significant.

Landscape Attributes

Blue Arrow Juniper is a dense multi-stemmed evergreen shrub with a narrowly upright and columnar growth habit. It lends an extremely fine and delicate texture to the landscape composition which can make it a great accent feature on this basis alone.

This is a high maintenance shrub that will require regular care and upkeep, and is best pruned in late winter once the threat of extreme cold has passed. Deer don’t particularly care for this plant and will usually leave it alone in favor of tastier treats. It has no significant negative characteristics.

Blue Arrow Juniper is recommended for the following landscape applications;

  • Accent
  • Vertical Accent
  • Hedges/Screening
  • General Garden Use

Planting & Growing

Blue Arrow Juniper will grow to be about 15 feet tall at maturity, with a spread of 4 feet. It has a low canopy, and is suitable for planting under power lines. It grows at a medium rate, and under ideal conditions can be expected to live for 70 years or more.

This shrub should only be grown in full sunlight. It is very adaptable to both dry and moist growing conditions, but will not tolerate any standing water. It is not particular as to soil type or pH. It is highly tolerant of urban pollution and will even thrive in inner city environments. This is a selection of a native North American species.

Gertens Sizes and Prices

Juniperus scopulorum ‘Blue Arrow’ (Rocky Mountain juniper ‘Blue Arrow’)

Botanical name

Juniperus scopulorum ‘Blue Arrow’

Other names

Rocky Mountain juniper ‘Blue Arrow’

Genus

Juniperus Juniperus

Variety or Cultivar

‘Blue Arrow’ _ ‘Blue Arrow’ is an upright, evergreen, coniferous shrub with a narrowly columnar habit. Its foliage is a vivid blue-green.

Foliage

Evergreen

Habit

Narrowly columnar, Upright

Toxicity

Foliage may cause skin irritation.

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Colour

Green, Blue in All seasons

How to care

Watch out for

Specific pests

Aphids , Caterpillars , Juniper scale

Specific diseases

Canker

General care

Pruning

Little or no pruning required.

Propagation methods

Semi-hardwood cuttings

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Where to grow

Juniperus scopulorum ‘Blue Arrow’ (Rocky Mountain juniper ‘Blue Arrow’) will reach a height of 2.5m and a spread of 0.5m after 20-50 years.

Suggested uses

Architectural, Gravel, Low Maintenance, Rock

Cultivation

Plant in any well-drained soil. Can tolerate hot sunny sites.

Soil type

Chalky, Clay, Loamy, Sandy (will tolerate most soil types)

Soil drainage

Well-drained

Soil pH

Acid, Alkaline, Neutral

Light

Partial Shade, Full Sun

Aspect

North, South, East, West

Exposure

Exposed, Sheltered

UK hardiness Note: We are working to update our ratings. Thanks for your patience.

Hardy (H4)

USDA zones

Zone 9, Zone 8, Zone 7, Zone 6, Zone 5

Defra’s Risk register #1

Plant name

Juniperus scopulorum ‘Blue Arrow’ (Rocky Mountain juniper ‘Blue Arrow’)

Common pest name

Cedar-Quince rust; Quince rust; Rust of apple; Rust of juniper; Rust of quince

Scientific pest name

Gymnosporangium clavipes

Type

Fungus

Current status in UK

Absent

Likelihood to spread to UK (1 is very low – 5 is very high)

Impact (1 is very low – 5 is very high)

General biosecurity comments

EU regulated rust disease which helps mitigate against introduction. A review of EU regulations will help to ensure that all hosts are regulated.

Defra’s Risk register #2

Juniperus scopulorum ‘Blue Arrow’ (Rocky Mountain juniper ‘Blue Arrow’)

Lamprodila festiva

Insect

Absent

Beetle that is native to Europe; whose larvae damage certain ornamental conifer species. Absent in the UK; so industry should source plants carefully and monitor for its presence.

Defra’s Risk register #3

Juniperus scopulorum ‘Blue Arrow’ (Rocky Mountain juniper ‘Blue Arrow’)

Cypress twig; borer

Argyresthia cupressella

Insect

Present (Widespread)

Likelihood to spread in UK (1 is very low – 5 is very high)

Has spread following introduction; little evidence of significant damage. Stakeholder groups may wish to monitor.

About this section

Our plants are under greater threat than ever before. There is increasing movement of plants and other material traded from an increasing variety of sources. This increases the chances of exotic pests arriving with imported goods and travellers, as well as by natural means. Shoot is working with Defra to help members to do their part in preventing the introduction and spread of invasive risks.

Traveling or importing plants? Please read “Don’t risk it” advice here

Suspected outbreak?

Date updated: 7th March 2019 For more information visit: https://planthealthportal.defra.gov.uk/

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