An almost level outline
Main stems follow the ground rather than forming a strongly raised central canopy. This broad, flat line is an essential cultivar characteristic.
Juniperus 'wiltonii' 13cm
Normal price
€9,00
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Juniperus ‘Wiltonii’
- Very flat spreading habit
- Fine flexible branches
- Silver-blue scale-like foliage
- Also known as ‘Blue Rug’
Juniperus ‘Wiltonii’ spreads like fine silver-blue fabric across the ground, following its contours with remarkable natural ease. Long, flexible branches unfold almost flat and carry tiny side shoots, creating a surface that looks calm from a distance and beautifully intricate close up. Among stones and clean edges, its cool colour suggests that a small piece of open sky has settled gently onto the earth.
Its charm lies in how little height it adds: stones, edges and taller plants remain visible while their bases are connected by a continuous silver-blue flow. At the edge of a low wall, the branches can continue downwards. An otherwise formal structure gains a more natural finish, and the garden seems to extend beyond its boundaries.
What makes it special
‘Wiltonii’, also known as ‘Blue Rug’, combines an exceptionally low spread with long flexible stems and fine, predominantly scale-like foliage.
Intricate fine shoots
Very small, mainly scale-like leaves clothe slender branches. The texture is finer than that of densely needle-bearing creeping forms.
Continuous silver-blue colour
Foliage remains through every season. In cold winters it may acquire a subtle purple tint without changing its basic flat architecture.
Why you will love it: it connects broad surfaces with fine silver-blue texture without hiding the stones and clean edges that give the space its character.
In the garden & on the balconyPlacement & plant combinationsFlat groundcover · low edges · open sunny space
Flow without height
Give it an open sunny area in a rock garden, on a broad slope or in a raised border. It can pass over a low edge without becoming an upright shrub. Allow approximately 2–2.5m of spread at ten years and potentially more at maturity, avoiding narrow paths or positions that are walked over.
Fine coastal textures
Small flowering cushions and low succulent-leaved perennials create clear, gentle contrasts around its silver-blue surface. Place them on the outer part of the composition, beyond future juniper cover, in sunshine and freely draining soil.
- Armeria maritima — small green tufts and pink flower heads add rounded accents above the flat base.
- Dianthus gratianopolitanus — blue-green foliage and pink flowers continue the cool palette in a different, more cushioned form.
- Sedum album — small succulent leaves fill separate rocky pockets away from branches that would eventually shade them.
Care at a glance
Light
Full sun encourages dense low cover. Avoid heavy shade, which thins its fine-textured surface.
Watering
Water thoroughly during establishment and check when the soil dries. Drought tolerance improves once established; pots need closer monitoring.
Climate & hardiness
RHS H7: very cold hardy, including temperatures below −20°C in a suitable position. Free drainage remains important, particularly in winter.
Safety
Harmful if eaten and a potential skin allergen. The small cones are not for consumption; wear gloves and prevent access by pets that chew plants.
Detailed careComplete care guideSeven practical points: Position, Watering, Soil, Feeding, Pruning, Planting and repotting, Cleaning.
Position
Choose open ground that you do not need to cross when maintaining other plants. Fine woody branches need room to spread and cannot serve as a walked-on path.
Watering
Water deeply when moisture declines within the soil, without keeping it permanently saturated. A new planting in summer heat needs more frequent checks than an established carpet.
Soil
Well-drained sandy or stony soils suit its use particularly well. If water stands after rain, improve the position first or use raised planting with an adequate depth of soil.
Feeding
Conservative feeding is enough. In poor soil or after long-term pot cultivation, apply a gentle spring feed according to the product instructions, avoiding excessive amounts.
Pruning
Remove damaged or dead shoots and adjust the perimeter selectively. Do not shear the entire surface or cut into bare wood expecting a quick recovery.
Planting and repotting
Keep the existing planting depth and arrange the branches carefully without forcing them to bend. A pot needs a broad surface, a freely draining mix and an unobstructed outlet for water.
Cleaning
Remove weeds before the cover closes and collect leaves trapped in the shoots. Keep the border edge accessible so you can check growth without stepping on it.
Development over timeThe silver-blue carpet unfoldsFine early stems · flat overlapping growth · broad low cover
At the beginning
Individual branches remain visible and cover is still incomplete. Its appearance in a pot does not show the width it can eventually achieve in the ground.
At around ten years
In suitable conditions, it can reach approximately 0.1m in height and 2–2.5m in spread. Fine stems form a very flat, dense surface.
With further development
At maturity, it can reach 0.1–0.5m high and 2.5–4m wide, over 10–20 years. This allows for differences in site and growth, not a change into an upright shrub.
Ten-year habit & dimensions
approximately ten years in a suitable positionHeight approximately 0.1mSpread 2–2.5mVery flat canopy
Indicative ten-year growth with stems close to the ground. At maturity, it can reach 0.1–0.5m high and 2.5–4m wide.
Form through time
two real statesSilver-blue all yearPossible subtle purple tint
Young establishment
A few arms spread around the base, with open gaps still visible between them.
Established winter crown
More side branches form dense cover with a darker winter tone.
Groundcover thickens as the main arms extend and add lateral branchlets.
What to expect after planting: Branches will cover more ground while retaining an exceptionally low profile. Do not treat the ten-year measurement as a permanently fixed limit to its spread.
History & originCultivar originVinalhaven, Maine · Jacob van Heiningen · 1914
In 1914 Jacob van Heiningen of South Wilton, Connecticut, found a natural variation of Juniperus horizontalis on Vinalhaven Island off the coast of Maine. It was retained in cultivation for its long, flexible branches and exceptionally flat silver-blue crown.
The selection became known as ‘Wiltonii’ and also spread under the commercial name ‘Blue Rug’, describing its carpet-like appearance. These names identify the same cultivar. Its origin lies in that wild plant rather than in a controlled cross.
Greenleaf for Plant NerdsScience nobody asked forBotanical details for anyone curious about what lies behind the plant’s appearance
A cone that resembles a small fruit
In Juniperus horizontalis, fleshy female cone scales form a small seed-bearing structure that resembles a berry. It does not develop from a flower or have an ovary wall like a true fruit. Cone production depends on the plant’s form and conditions.
Frequently asked questions
Essential answers about its genuinely low habit, space requirements and use as groundcover.
01Is ‘Blue Rug’ a different cultivar?
No. ‘Blue Rug’ is a widely used synonym for ‘Wiltonii’, describing its exceptionally low silver-blue cover.
02Can I walk on it like a lawn?
No. It is a woody conifer, not a walking surface. Its branches can be damaged by foot traffic even though it looks like a carpet.
03How much room should I leave?
A spread of approximately 2–2.5m is a useful ten-year guide, but mature spread may reach 2.5–4m. Plan around the space available over the longer term.
04Can it trail over a pot rim?
Yes. Fine flexible branches can follow the rim and continue downwards, provided roots have enough room and watering is monitored carefully.
05Does it lose its foliage in winter?
No, it is evergreen. Cold conditions may bring a gentle purple tint; extensive dry brown sections are not its normal winter appearance.
06Are the round blue cones edible?
No. It is not grown as an edible plant. The cones’ resemblance to berries does not make them suitable for consumption or safe for pets to access.
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