Low-growing blue junipers are evergreen, spreading shrubs that bring cool blue or silvery color to sunny slopes, borders, and containers. To establish one successfully, choose a variety suited to the space, provide well-drained soil and plenty of sun, and avoid overwatering. Before planting, check the mature spread on the plant label: many ground-hugging types grow much wider than their nursery pots suggest.
What You’ll Need
- A low-growing blue juniper suited to your climate and available space. Cultivars vary in color, hardiness, and mature size.
- A sunny planting site with well-drained soil; a site receiving at least six hours of direct sun is a good target.
- A spade or hand trowel, gardening gloves, and water.
- Organic mulch, such as shredded bark, if desired. Keep it away from the stem and foliage.
- For heavy clay or a poorly drained site, choose a different location or a raised planting area rather than trying to fix a wet planting hole.
Step-by-Step
- Choose the right juniper. Look for a named cultivar described as low-growing, spreading, or ground-hugging. Read the label for mature height and width, not just the plant’s current size. Some varieties form a compact mound; others spread several feet or more. Confirm that the plant is hardy in your region and appropriate for the site. Blue foliage color is usually strongest in full sun, though exact color varies by cultivar and season.
- Pick a sunny, well-drained location. Junipers tolerate a range of soils but do poorly where water sits around their roots. Avoid low spots, downspouts, and areas that remain soggy after rain. If the soil is heavy clay, planting on a slope or in a raised bed can improve drainage. Do not add gravel to the bottom of the hole; it does not reliably improve drainage and can leave water perched above it.
- Allow room for the mature spread. Measure the space and compare it with the plant label. If planting several, space them according to their expected mature widths and the coverage you want. Closer spacing fills an area sooner but can lead to crowding and poorer airflow. Keep the plant clear of paths, walls, and other shrubs if its branches would eventually obstruct them.
- Plant at a suitable time. Early spring or early fall is generally a good time in many climates, when temperatures are moderate and the soil is workable. Avoid planting during very hot, dry weather or when the ground is frozen. Water the nursery plant before removing it from its container so the root ball is evenly moist.
- Prepare the planting hole. Dig a hole about twice as wide as the root ball and no deeper than its height. Loosen the soil at the sides of the hole. Do not make the hole excessively deep or fill it with rich compost; the aim is to let roots grow into the surrounding soil, not to create a water-holding pocket.
- Set the plant at the correct height. Slide the juniper out of its pot and gently loosen roots circling tightly around the outside. Set it so the top of the root ball is level with, or just slightly above, the surrounding ground. Keep the crown—the point where stems meet the roots—unburied. Backfill with the original soil, firming gently to remove large air gaps without packing it hard.
- Water thoroughly and mulch lightly. Slowly water the root zone so the soil around the root ball is moist, not flooded. Spread a thin layer of mulch over the root area if desired, leaving a clear gap around the crown and stems. Mulch touching the foliage can trap moisture and encourage decay.
- Monitor water while it establishes. During the first growing season, check soil moisture every few days at first, then adjust for rainfall, temperature, and soil type. Water when the soil a few inches down begins to dry; apply water to the root zone rather than repeatedly wetting the foliage. Once established, many junipers are drought-tolerant, but prolonged heat and dry spells may still require watering.
- Keep care simple after establishment. Remove weeds before they compete with young roots. Junipers usually need little fertilizer; avoid routine feeding unless a soil test or clear growth problem indicates a need. Prune only to remove dead, damaged, or misplaced growth. Cut back to a living, green side shoot, because many junipers do not regrow well from cuts into bare, old wood.
Common Mistakes
- Planting in shade: Too little sun can weaken growth and reduce the blue tone. Choose a brighter site if possible.
- Ignoring mature width: A small nursery plant may spread beyond a narrow border. Check the label and plan spacing before digging.
- Overwatering or choosing wet ground: Constantly damp soil can cause root problems. Check drainage and let the soil begin to dry between waterings.
- Planting too deeply: Buried crowns and stems may rot. Keep the root ball’s top level with the soil surface.
- Shearing into bare wood: Old, leafless interior branches may not produce new growth. Make selective cuts where green foliage remains.
- Applying fertilizer without a reason: Excess nutrients can encourage weak growth. Use a soil test to guide amendments instead.
Tips
- Keep the plant label or photograph it before planting; cultivar names help you look up its mature size and care needs later.
- For a slope, position the root ball securely and water slowly so runoff does not carry soil away.
- In containers, use a pot with drainage holes and a well-draining potting mix. Containers dry faster than garden soil, so check moisture regularly, especially in hot weather.
- Wear gloves when handling juniper. Some varieties have prickly foliage, and people with sensitive skin may find it irritating.
- Inspect foliage periodically for discoloration, webbing, or dieback. Catching a problem early makes it easier to correct watering or investigate pests.
Troubleshooting
Foliage is turning brown: Check soil moisture around the root ball. Dry soil can indicate inadequate water, while persistently wet soil suggests poor drainage or overwatering. Brown patches may also follow winter exposure, transplant stress, or physical damage. Remove dead tips only after confirming where healthy green growth remains, and correct the underlying cause before pruning.
The plant is yellowing or declining despite watering: More water may make the problem worse if the soil is saturated. Check that the planting site drains freely and that the root flare is not buried. If decline continues, inspect for root or stem damage and contact a local nursery or extension service with clear photos.
Growth is sparse or the color is dull: Confirm that the plant receives adequate sun and is not crowded by taller plants. Give a newly planted juniper time to establish; avoid trying to force growth with heavy fertilizer.
Branches are spreading into a path or other plants: Prune selectively while there is still green growth on the branch. If regular cutting would leave bare wood, relocate a young plant while it is dormant or replace it with a more compact cultivar.
Foliage has fine webbing or stippled, faded patches: Spider mites may be present, particularly in hot, dry conditions. Inspect the undersides of branches and ask a local garden professional to confirm the cause before treating. Avoid broad-spectrum pesticides that can harm beneficial insects.
Frequently Asked Questions
How fast does a low-growing blue juniper grow?
Growth depends on the cultivar, climate, soil, and care. Many spread gradually rather than rapidly. Use the plant label’s mature dimensions to plan instead of relying on a general growth-rate estimate.
How much sun does blue juniper need?
Full sun—about six or more hours of direct light—is generally best for dense growth and strong foliage color. Some cultivars tolerate partial shade, but may grow less densely or appear less blue.
How often should I water it?
There is no fixed schedule that fits every site. Water newly planted junipers when the root zone begins to dry, accounting for rainfall and soil type. Established plants usually need less frequent watering, except during extended dry spells.
Can I grow low-growing blue juniper in a pot?
Yes, if the chosen cultivar fits the container long-term. Use a pot with drainage holes and well-draining potting mix, and check moisture often. Protect container roots from severe winter cold where necessary for your climate.
Can I trim a juniper that has grown too large?
Light, selective pruning is possible where green foliage remains. Avoid cutting back into bare interior wood, which often stays bare. If the plant has outgrown its location, replacing or relocating it is usually more reliable than severe pruning.
Is low-growing blue juniper deer-resistant?
Junipers are often less appealing to deer than many garden plants, but no plant is deer-proof. Local deer pressure and food availability affect browsing.