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Juniperus horizontalis Jade River

Juniperus horizontalis Jade River
Creeping Juniper, Creeping Cedar, Creeping Savin

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A variety of creeping Juniper that is particularly low-growing and forms a superb ground cover. Not exceeding 25cm (9.8in) in height, it spreads along the ground, equally at home in rockeries as well as on slopes. Its grey-blue foliage is highly decorative and takes on violet hues in the cold winter. Being hardy, this conifer adapts to the majority of growing conditions, especially poor and dry soils. It withstands wind and diseases well and requires no maintenance, making it an easy plant that only fears excessive water in winter.
Height at maturity
25 cm
Spread at maturity
1.50 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -29°C
Soil moisture
Dry soil, Moist soil
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Best planting time March, October
Recommended planting time February to April, September to November
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Description

Juniperus horizontalis 'Jade River' is a variety of horizontal juniper that stands out for its grey-blue foliage, turning purple in winter. Like other varieties, it spreads widely while remaining very low and dense. It is therefore a very good ground cover plant to fill a slope or dress up a rockery. Very hardy, this conifer appreciates a neutral to limestone soil, even poor or sandy, in any case, well-drained. Loving full sun, it also grows in partial shade and proves easy to cultivate.

Juniperus horizontalis is a prostrate evergreen conifer, belonging to the Cupressaceae family. This family includes other common species, such as cypresses, Thuja, and Chamaecyparis, or less known, such as the majestic Fitzroya from South America or the Callitris from Australia. This horizontal juniper is native to the northern regions of North America, which explains its excellent hardiness (-25 to -30 °C). In its natural environment, it has a prostrate, widely spreading habit, reaching 45cm (17.7in) thick and 2 to 4m (6ft 7in to 13ft 1in) wide. This species appreciates cool climates, poor, sandy and/or limestone soils, and is not afraid of arid conditions.

The 'Jade River' juniper, derived from this species, forms a low bush, with a very spreading habit, measuring 25cm (9.8in) in height and 1.50m (4ft 11in) in width after 10 years. Its foliage consists of small, soft and non-prickly needles, with a beautiful grey-blue hue. When cold weather arrives, the foliage takes on a purple-violet hue, renewing its aesthetics. Truly hardy (-20 °C), it adapts to many types of soils, provided they are well-drained, even once well-rooted and dry. It is therefore a particularly easy plant to cultivate and highly recommended for beginners. 

The 'Jade River' horizontal juniper is a precious small conifer, very frugal, which will be perfect for covering a slope, running along the edge of a dry stone wall, or spreading between rocks in a sunny rockery. Its limited development and relatively slow growth will also allow it to be grown in a pot. An inherently graphical plant, it will find its place in a contemporary garden with geometric lines, in a rockery or a mineral or Mediterranean garden.
Developing mainly in a horizontal plane, it can easily be associated with plants with columnar growth (such as the variegated golden yew 'David' forming a contrast of shape and colour), or globular-shaped shrubs, such as the small Berberis 'Admiration' which lives up to its name, or even topiaries.
Similarly, strong colour contrasts can be created by planting wig trees - which, like it, tolerate limestone and poor soils - with purple foliage ('Royal Purple' smoke bush) or golden foliage ('Golden Spirit' smoke bush).

Juniperus horizontalis Jade River in pictures

Juniperus horizontalis Jade River (Foliage) Foliage
Juniperus horizontalis Jade River (Plant habit) Plant habit

Plant habit

Height at maturity 25 cm
Spread at maturity 1.50 m
Habit creeping
Growth rate normal

Foliage

Foliage persistence Evergreen
Foliage colour grey or silver
Foliage description Evergreen.

Botanical data

Genus

Juniperus

Species

horizontalis

Cultivar

Jade River

Family

Cupressaceae

Other common names

Creeping Juniper, Creeping Cedar, Creeping Savin

Origin

Cultivar or hybrid

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Planting and care

Juniperus horizontalis 'Jade River' should be planted from September to November and from February to April in well-drained, light, even chalky and poor soil. A rocky or sandy and dry soil in summer does not bother it once it is well-rooted. Choose a very sunny or semi-shaded location sheltered from prevailing winds. Soak the root ball in a bucket of water before planting and water after positioning the plant and filling the planting hole.
Add organic amendment at planting and water generously in the first few years, in case of prolonged drought. Apply a special conifer fertilizer every year in April and cultivate the soil in summer. This very hardy conifer fears heavy, waterlogged soils in winter. Pruning is not necessary, on the contrary, as this plant expresses its full potential when allowed to grow freely. If pruning is necessary, it should be done between June and September. In this case, take care to only prune the young shoots, as the old branches, devoid of needles, do not regenerate.

Planting period

Best planting time March, October
Recommended planting time February to April, September to November

Intended location

Suitable for Meadow, Rockery
Type of use Border, Edge of border, Container, Slope
Hardiness Hardy down to -29°C (USDA zone 5) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Neutral, Calcareous
Soil type Chalky (poor, alkaline and well-drained), Silty-loamy (rich and light), Stony (poor and well-drained)
Soil moisture Dry soil, Moist soil, well-drained

Care

Pruning No pruning necessary
Soil moisture Dry soil, Moist soil
Disease resistance Good
Overwinter Can be left in the ground

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