Blue Arrow Juniper

Blue Arrow Juniper (Juniperus scopulorum ‘Blue Arrow’) Care Guide

Overview:
Blue Arrow Juniper is a slim, columnar evergreen with blue-gray foliage and a narrow, upright habit. It adds vertical interest to landscapes and performs well in restricted spaces. It is relatively low-maintenance and works well as a screen, specimen, or accent shrub.

1. Planting & Growing Conditions

• Hardiness Zone: 4–9 — able to survive fairly cold winters. 

• Mature Size: About 15 ft (≈ 4.5 m) tall and only 2 ft (≈ 0.6 m) wide in ideal conditions. 

• Light Requirements:

  • Full sun is ideal (6+ hours of direct sunlight) for dense foliage and healthy growth. 

• Soil Requirements:

  • Prefers well-drained soil—can tolerate loam, clay, or sandy soils, as long as oversaturation is avoided.

  • Poor drainage or soggy soils can lead to root issues. 

• Planting Depth & Spacing:

  • Dig a hole about 1.5× the width of the root ball, placing the top of the root ball slightly above or flush with the surrounding soil surface to promote drainage. 

  • Space 2–3 feet apart if using as a hedge or screen. 

2. Watering & Maintenance

• First Season: Water regularly to establish roots—keep the soil moist but not waterlogged. 

• Once Established:

  • Very drought-tolerant; water only during extended dry periods. 

  • Avoid overwatering, especially in heavy or poorly drained soil. 

• Mulching:

  • Apply a 2-3 inch layer of mulch around the base to conserve moisture and suppress weeds, keeping mulch a few inches away from the trunk. 

3. Fertilizing

• Use a balanced slow-release fertilizer in early spring to support healthy growth. 

• Avoid excessive fertilization, which may promote soft growth vulnerable to winter injury.

4. Pruning & Maintenance

• Pruning Needs: Minimal — Blue Arrow holds its narrow columnar form naturally. 

• Best Pruning Time: Late winter to early spring, before new growth begins. 

• How to Prune:

  • Remove dead, damaged, or crossing branches to maintain health and shape

  • Light shaping is acceptable, but avoid cutting back into old wood, as junipers don't regenerate well from deep cuts

5. Foliage, Seasonal Interest & Wildlife

• Foliage Color: Blue-gray evergreen needles that maintain color year-round. 

• Form: Very narrow, upright, and columnar — excellent where horizontal space is limited

• Wildlife Value: Provides some cover for birds; cones may be eaten by birds (though minor). 

6. Pest & Disease Management

• Common Issues:

  • Junipers can be susceptible to twig or needle blight, root rot in soggy soils, and pests like scale, aphids, mites, or bagworms. 

• Prevention & Control:

  • Ensure good air circulation, avoid overcrowding

  • Avoid overhead watering

  • Prune out infected parts early

  • Plant in well-drained soils to reduce root disease risk

7. Winter Protection

• Cold Hardiness: Suited to cold climates; rarely needs special protection in zones 4 and above

• Mulching: Light mulch over the root zone in colder areas can buffer temperature swings in winter

8. Landscape Uses

Excellent for narrow hedges, vertical accents, and tight spaces
Use as a backdrop or spire in mixed plantings
Great in rock gardens or xeriscapes because of drought tolerance
Easy-care choice for evergreen structure in gardens