How to Grow Bar Harbor
Wikimedia Commons
Bar Harbor
Juniperus horizontalis 'Bar Harbor'
shrubBar Harbor is a low-growing, creeping juniper cultivar prized for its dense, feathery blue-gray foliage and prostrate growth habit. It spreads horizontally to form attractive ground cover and turns purplish in cooler months. This evergreen shrub is extremely hardy, drought-tolerant, and requires minimal maintenance once established.
When should you plant Bar Harbor in your zone?
Get a personalized planting timeline — when to start seeds, transplant, and harvest — based on your USDA zone and local frost dates. Free to start.
Example Bar Harbor timeline · Pittsburgh, PA (Zone 6b)
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Plant Bar Harbor
Around Apr 17Near Pittsburgh's average last spring frost.
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Tend & protect
Late spring–summerWatering, feeding, and pest-watch reminders.
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Harvest Bar Harbor
Late summer into fallBefore the first fall frost (≈ Nov 8)
Sample dates for Pittsburgh, PA. Sign up to get exact Bar Harbor dates for your own zip code.
Growing Conditions
Soil
Growing Zones
Find your zone →Thrives in zones 3-9, with excellent cold hardiness to -40°F or lower
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Get my Bar Harbor timeline →Growth Stages
Establishment
3-6 monthsYoung transplant with initial horizontal growth beginning; foliage is bright blue-gray
Water weekly during first season; keep soil consistently moist but not waterlogged. Mulch around base to retain moisture and regulate temperature.
Vegetative Spread
6-18 monthsPlant develops horizontal branches and spreads outward; foliage becomes denser and more feathery
Continue regular watering through year two. Minimal pruning needed; remove any upright growth. Fertilizer rarely needed in average soil.
Dense Ground Cover
Ongoing (year 2 onward)Mature spreading form 6-12 inches tall with dense, fine-textured blue-gray foliage covering ground completely
Reduce watering as drought tolerance increases. Prune only to remove dead wood or redirect growth. Monitor for spider mites in hot, dry climates.
Seasonal Color Change
October-April (varies by climate)Foliage deepens to purple, bronze, or plum tones during fall and winter months
This is a normal, desirable characteristic. No special care needed. Colors revert to blue-gray in spring.
Mature Maintenance
3+ yearsFully established ground cover requiring minimal input; can spread 6-8 feet across
No fertilizer needed. No watering after establishment. Remove occasional dead branches. No regular pruning required unless shaping desired.
Companion Planting
Plan your garden →Plant with:
Avoid planting near:
Common Pests
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Increase humidity with occasional misting; insecticidal soap for heavy infestations; rarely needed in cooler climates
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Horticultural oil spray in early spring; prune out heavily infested branches
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Hand-pick bags in fall/winter; Bacillus thuringiensis (Bt) spray in spring when small
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Prune out infected branches; improve air circulation; avoid overhead watering
Uses
Ground Cover & Erosion Control
LandscapeBar Harbor's dense, spreading habit and shallow root system make it ideal for slope stabilization and erosion control. Its fine texture creates attractive patterns while protecting soil from washing away. [source]
Wildlife Habitat
WildlifeDense foliage provides shelter and nesting sites for small birds, insects, and ground-dwelling wildlife. The evergreen nature ensures year-round protection. [source]
Low-Maintenance Xeriscaping
HouseholdExtreme drought tolerance and minimal fertilizer/pruning needs make Bar Harbor perfect for water-wise and sustainable landscapes. Ideal for regions with water restrictions. [source]
Rock Gardens & Alpine Beds
LandscapeThe fine texture, compact growth, and preference for well-draining soil make Bar Harbor an excellent choice for rock gardens, alpine gardens, and gravel landscapes. [source]
Winter Interest & Color Accent
HouseholdBar Harbor's seasonal color change to purple-bronze tones in winter provides visual interest when many plants are dormant. Its evergreen structure offers structure year-round. [source]
Harvest Tips
Not harvested; grown for ornamental foliage. Dead or damaged branches can be removed anytime. Light pruning to redirect growth best done in early spring.
Fun Facts
- 🌱 Bar Harbor is named after a city in Maine and was developed for regions experiencing harsh winters and coastal conditions, making it exceptionally cold-hardy and salt-tolerant.
- 🌱 The foliage color change from blue-gray in summer to purple-bronze in winter is triggered by cold temperatures and increased anthocyanin production—a natural anti-freeze mechanism.
- 🌱 A single mature Bar Harbor plant can spread 6-8 feet across, making just a few plants capable of covering large ground areas in 3-4 years.
Gardening Terms
New to gardening? Learn about terms used in this guide:
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