Do you know the old saying about how good things come in small packages? Creeping junipers rarely stretch above a foot or so tall, but they make an outsized impact.
This species of evergreen comes in some unusual colors like yellow and silver, and they can spread up to 10 feet wide, which means you get a ton of coverage with one easy-going specimen.
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That’s a lot to recommend them and we haven’t even started talking about maintenance yet. Or, rather, the lack of it. Creeping junipers truly are “set it and forget it” plants.
To help you understand everything there is to know about this classic option for the garden, here’s what we’re going to chat about:
What You’ll Learn
When I was a kid, I thought my mom called these plants “creepy” junipers.
That made me like them even more. I pictured them growing around some strange castle, al la a Tim Burton film. Alas, even after I realized I had misheard her and my ghoulish fantasy was dashed, I still held a soft spot for them.
When I became an adult and realized how stellar these plants are in the garden, I fell even more deeply in love. By the time you finish reading this guide, I hope you’re just as enamored as I am.
What Is Creeping Juniper?
Juniperus horizontalis hails from cold, dry areas spanning the US from New England to Alaska and throughout Canada.
Its compact, creeping growth habit reveals the way it adapted to grow in windy, high-altitude spots like stony outcroppings, rugged cliffs, and rocky slopes. You might also find it in prairies or on sand dunes.
This is no delicate flower. Er, shrub. It’s a tough plant that evolved to survive in environments where other species can’t. That makes it perfect for those of us who want something low-growing and fuss-free.
It grows to about two feet tall and 10 feet wide, depending on the cultivar, with opposite scale-like leaves that start out as needle-like when the leaves are young.
Foliage can range from true green to blue or even purple, and species plants produce gray-blue to dark blue cones in the wild, which we refer to commonly as juniper berries.
But the plants you’ll find at nurseries will not typically produce these. If growing edible fruits is your goal, this isn’t the best option, not only because these plants tend to be smaller than other species of juniper, but it can be harder to find fruiting varieties.
J. horizontalis plants are dioecious, meaning the male and female parts are produced on separate plants, and in order to produce berries, you need both.
Fortunately, there are so many junipers out there that you rarely need to worry about pollination, particularly since different species can pollinate each other.
This type of juniper is tolerant of salt and pollution, and it is largely ignored by deer and rabbits – perfect if you’re struggling to find something that will thrive in a challenging spot in your garden.
Even if you aren’t battling adverse conditions, creeping juniper is still a fantastic option simply because it’s good-looking and offers year-round color and interest.
Cultivation and History
Junipers in general have been cultivated for centuries, with records of cultivated J. communis going back to 1560. It’s not exactly clear when people first started cultivating J. horizontalis, but it has likely been a long, long time.
There are dozens of cultivars of this North American native available today, and all of them feature the characteristic prostrate form described by the Latin epithet horizontalis.
They can vary in size and color from one to the next, but you aren’t going to find a columnar or pyramidal creeping juniper. That’s probably not a surprise.
Because of its shape, with its long, slender branches, creeping junipers propagate well from cuttings. You can also purchase many different cultivars for transplanting.
Don’t bother with trying to start these plants from seed. It takes years and tons of knowledge, and even then you’ll probably struggle with low germination rates.
J. horizontalis is popular as a bonsai option. Most practitioners start new projects using cuttings, because it’s reliable and you can be certain that clones will reproduce the characteristics that you want.
The best wood is young but firm, so new growth that has had the summer to mature is ideal. In the fall, look for wood that is pliable and still has a green hue to it.
Gently tear a six-inch length of stem off, pulling in the opposite direction from the growth.
If you took a bunch of excess bark off when you pulled, trim most of it away, leaving a heel of less than half an inch. Remove the leaves from the bottom half.
Dip the cut end in a rooting hormone, like this one from Bonide.
If you don’t already have some of this gardening kit staple in your at home, grab a one-and-a-quarter-ounce bottle at Arbico Organics.
It will last you a good long while.
Stick the cutting into a six-inch container filled with potting soil so it’s covered by half. You might want to make a little hole first. This helps retain more of the rooting hormone and reduces the chance that you’ll damage the cut end.
Firm the soil around the cutting and water so the soil feels moist, like a well-wrung-out sponge. Place it in bright, indirect light. Allow the surface of the soil to dry out in between watering.
Now it’s time to start a new knitting project, finish up painting the basement, or whatever else you have to occupy yourself over the next few months. By spring, your cutting should have roots and new growth forming.
You can give the plant a gentle tug to see if those roots have taken hold. If it resists, you can be confident that all is good below the soil.
Once the last frost has passed, start hardening off the plant. Take it outside and leave it in a sheltered spot for an hour before bringing it back inside. For the next seven days, add an hour each day. Now your plant is ready to go into the ground.
Don’t worry too much if a brief frost is in the forecast. Just bring the plant inside and skip a day of hardening off until the weather warms again.
Creeping juniper seedlings require little prep compared to some other species like, say, roses. Just dig a hole about as wide and as deep as the pot that the plant came in. Remove the juniper from its container and gently loosen the roots.
Plop it into the hole, fill in around it with soil, and offer up some water.
If your soil is any type ranging from sandy to clay, you don’t need to do anything to prepare the area.
But if it’s heavy clay and drains poorly, there’s really not much you can do besides find a different species to grow there. May I suggest creeping Jenny (Lysimachia nummularia) or sweetflag (Acorus calamus)?
How to Grow
These plants prefer dry, well-drained, sandy soil with lots and lots of sun. The fastest way to kill most junipers is to plant them somewhere with heavy, poor draining, moist soil. Save those spots for hostas and irises.
J. horizontalis can tolerate heavy soil, though. It just can’t stay constantly wet. It never hurts to work in some well-rotted compost to improve sandy or clay earth.
A few hours of shade are no big deal, but these plants tend to be healthier in full sun. Choose a spot with full sun, if possible.
There’s no need to fertilize – woohoo! Your job is just to make sure the shrub receives some moisture whenever the top two inches of soil dry out. Stick your finger into the soil down to the second knuckle or use a moisture meter.
You can also grow creeping juniper in containers quite easily. Use standard potting soil and choose a container at least one size larger than the pot that it came in.
You’ll need to upgrade the pot size once every few years if you want to encourage it to grow to its full size. If you want to keep it smaller, don’t bother sizing up.
Junipers in pots don’t need to be fed, but you should change the soil every two years, whether you repot in a larger container or not.
- Grow in full sun or partial sun.
- Avoid constantly wet soil.
- Allow the top two inches of soil to dry out between watering.
Pruning and Maintenance
Don’t worry about pruning your junipers.
Just take off any dead or diseased branches when you see them, and let the shrub take on a natural shape.
Cultivars to Select
There are plenty of creeping juniper options out there and new ones are always coming onto the market. Many cultivars are fairly similar, varying slightly in color and size, which is excellent because this allows you to find exactly what you want.
Here are a few good options:
At just a foot tall once mature, ‘Blue Forest’ is better suited as a forest for fairies and elves than humans. But if you hunker down at ground level to check this low-growing cultivar out, you can see where the name comes from.
Not only does the foliage have a distinct blue hue, but the branches grow upright with a conical shape, giving the impression of a tiny little forest of junipers.
‘Wiltonii,’ also known as blue rug juniper, makes the perfect carpet for practically any spot in the garden.
At just a foot tall and stretching to six feet wide, it forms a dense rug that blocks out weeds and prevents erosion, all while providing year-round interest.
It will weep gracefully over rocks, walls, or pots. Or you can let it crawl over a challenging area where other plants struggle to gain footing.
Roll out the red carpet for this gem and head to Fast Growing Trees for a live plant in a one-, two-, or three-gallon nursery container.
With a classic, creeping form and lovely silvery-blue foliage, ‘Hughes’ is an excellent choice for rocky slopes and arid spots. It’s a tough ground cover that won’t let any weeds poke their way through.
Bring home this bad boy from Nature Hills Nursery in a #1 or #2 container.
‘Lime Glow’ is a low-growing, vase-shaped shrub that brings intense color to your yard with its chartreuse foliage. In the winter, the show continues as the leaves transition to copper, purple, and orange.
While it will obviously make a charming ground cover, the long, arching branches make it particularly nice for gracefully tumbling over the edge of pots or extending down a rock wall.
It can spread up to three feet wide but never grows more than a foot tall, and usually stays shorter than that.
Eureka! We’ve struck the ‘Mother Lode’ with this brilliant, gold-colored juniper.
Yes, the yellow-orange foliage is fabulous, but it’s not just the color that matters when you’re hunting for the goods. It’s the quantity that counts, and this plant can spread up to 10 feet wide but stays a manageable five or so inches tall.
In the fall, the foliage turns purple and orange, adding interest to the winter landscape.
Managing Pests and Disease
All junipers are known for being downright tough. The annoying bugs and pathogens that make a meal out of so many plants seem to ignore junipers. And even if they are attacked by something, they tend to survive better.
You have to love a plant that is pretty much untroubled by pests. Still, no plant is totally immune to pesky visitors. While it’s unlikely that you’ll ever have to worry about infestations, you should be aware of the few to watch for.
Spruce spider mites (Oligonychus ununguis) love to gnaw on junipers and spruces.
These teeny-tiny spider relatives use their even tinier mouthparts to penetrate the bark and suck the sap from inside. They’re so small that they’re difficult to see with the naked eye, so watch for the symptoms instead.
Look for yellow spots on the foliage and browning, dying leaves. You might also see super fine webbing all over the plant. They thrive in the cool weather of spring and fall. Left unchecked, they can destroy a juniper in just a few years.
Their presence is usually a sign that something is out of whack in your garden, whether that’s an overuse of pesticides or a lack of biodiversity to draw in natural predators like lacewings and ladybugs.
Control is simple. Just blast the stems and leaves with a strong spray of water once every few days and trim off any dead bits. Keep at it for a few weeks, especially in the spring and fall.
Don’t use pesticides to control these pests. You might stop them in the short term, but chances are they’ll return with a vengeance.
Juniper scale (Carulaspis juniperi) is extremely similar to mites in that an infestation signals a larger problem in your garden. The symptoms also look the same, though they don’t produce fine webbing.
If you look closely at the stems, you can actually see these bugs. They look like little lumps and bumps all over the stems. If you scrape them, they’ll come off.
Don’t sit on this problem if your juniper is loaded with scale. After a few years of feeding, your juniper may be beyond saving. Treatment takes a few seasons, too.
Spray the plant with horticultural oil thoroughly in late fall, again in mid-winter, and once more in early spring. This smothers the adults and developing juveniles.
Horticultural oil is a nice product to keep around because it can serve many purposes in the garden.
Pick up a quart of ready-to-use or ready-to-spray horticultural from Monterey, or pint-, quart-, or gallon-size concentrate, at Arbico Organics.
All junipers are susceptible to cedar apple rust, but J. horizontalis much less so. Instead, be on the lookout for blight.
There are several types of blight that may impact junipers, but Cercospora blight is the most common.
Caused by the fungus Cercospora sequoiae var. juniperi, you’ll know your plants have it when the inside, lower leaves turn brown.
These are the older leaves and they’re typically the first to be impacted by this disease. Over time, it spreads to the upper, outer leaves.
When you see these symptoms, prune the infected branches off. That should be enough to take care of the problem.
But if not, copper fungicide can finish the job. I try to always keep copper fungicide on hand because it can tackle a number of different diseases and it isn’t as terrible for the environment as some other harsh chemicals can be.
Bonide sells 32-ounce ready-to-use bottles, 16- and 32-ounce hose end bottles, and 16-ounce concentrate, which you pick up at Arbico Organics.
If you enjoy the art of bonsai, creeping juniper is a good option for creating weeping forms.
Otherwise, these make an excellent ground cover or specimen for xeriscaping or rock gardens.
Quick Reference Growing Guide
|Blue (berries)/yellow, green, bronze, purple
|Drought, salt, depleted soil
|Hardiness (USDA Zone):
|Sandy to clay
|Evergreen with persistent berries
|Full sun to part shade
|Time to Maturity:
|5-10 years, depending on cultivar
|Same depth as container
|Lavender, rose, sedum, spruce, sunflower
|18 inches to three feet, depending on cultivar
|Avoid Planting With:
|Up to 2 feet
|Bonsai, ground cover, specimen
|Up to 10 feet
|Slow to moderate
|Common Pests and Disease:
|Scale, spider mites; blight
Look Down for Carefree Beauty
Not everything has to be towering and substantial to make a statement in the garden. Creeping junipers can make a huge impact without ever reaching above your knees.
They’re so simple to care for, though, that it’s easy to forget that they’re even there. You don’t need to prune, don’t need to worry about feeding, and watering is an easy proposition.
How do you intend to use your new creeping friend? Be sure to share with us in the comments.
If you’re just beginning your juniper journey and you can’t get enough info about these enchanting evergreens, check out some of our other guides: