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Chinese Juniper (Juniperus chinensis)

Juniperus chinensis is a perennial evergreen conifer that may grow as a tree or shrub, with form varying greatly among cultivars; 'Itoigawa' is a cultivated form used for bonsai.

LightIt grows in full sun to partial sun.
WaterThe growing medium should drain well and may be kept moderately moist, although established plants tolerate some drought; container plants should be watered after the surface begins to dry and supplied with water regular
TemperatureIt is generally frost hardy. A single source reports cold tolerance to about -30 °C. Sources differ in descriptions of its hardiness-zone range.
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Chinese Juniper illustration

Overview

Juniperus chinensis is a perennial evergreen conifer that may grow as a tree or shrub, with form varying greatly among cultivars; 'Itoigawa' is a cultivated form used for bonsai.

Origin and habitat

Sources differ on its native range, describing East Asia and adjacent regions including China, Japan, the Korean Peninsula, Taiwan, Myanmar, and the Russian Far East, with some also including Mongolia. It occurs on coastal rocks, sandy ground, open rocky slopes, and in mountains; some alpine forms occur among boulders and rocky outcrops, and it can also grow in secondary vegetation, while cultivated plants are widespread in gardens, parks, and coastal environments. It has broad climatic adaptability, tolerating cold as well as strong sun, relatively dry conditions, and coastal environments.

Characteristics

Sources differ on mature height, giving a range of about 100–2500 cm. A single source reports a mature spread of about 400–800 cm. Sources differ in their descriptions of its growth rate, with slow growth reported. The foliage is dimorphic: juvenile leaves are needle-like, while mature leaves are usually scale-like and closely pressed to the twigs; needle-like juvenile foliage can still occur on lower, shaded, or pruned branches of mature plants, and foliage is mainly green to dark green. It is reported to lack typical flowers and instead bears male and female cones, usually on separate plants but occasionally on the same plant; the male cones are small and are usually borne at the tips of scale-leaved twigs. Sources differ on the reproductive season, describing it from late winter through spring, with some reporting pollen release from male cones in early spring; sources also differ in descriptions of the nearly spherical, fleshy, berry-like seed cones, which mature to black-purple, blue-black, or another dark color and often have a whitish bloom, contain multiple seeds, and take an extended period to mature.

Light

It grows in full sun to partial sun.

Watering

The growing medium should drain well and may be kept moderately moist, although established plants tolerate some drought; container plants should be watered after the surface begins to dry and supplied with water regularly in summer.

Temperature and dormancy

It is generally frost hardy. A single source reports cold tolerance to about -30 °C. Sources differ in descriptions of its hardiness-zone range.

Growing medium and mounting

It adapts to varied soils but requires good drainage and can grow in sandy, loamy, clay, and calcareous soils under acidic through alkaline conditions; some sources indicate a preference for neutral to slightly alkaline conditions.

Propagation

The species can be propagated from seed, while cultivars can be grafted; propagation from semi-hardwood cuttings is also reported.

Common problems

It is reported to be susceptible to aphids, scale insects, conifer red spider mites, and caterpillars. Reported diseases include Phytophthora, canker, honey-fungus-related disease, and rusts of the cedar-apple-rust type. Juniperus can serve as an alternate host for rust pathogens affecting fruit trees such as pears and apples, so planting nearby is restricted or avoided in some fruit-growing areas. Established plants in the ground tolerate drought, cold, and exposed conditions, but container-grown plants in cold regions need protection against freezing of the root zone.

Identification

It is evergreen and may bear both needle-like juvenile leaves and scale-like mature leaves on the same plant; the foliage and branches are aromatic, and the trunk can develop a twisted form. Among Juniperus chinensis bonsai forms, 'Itoigawa' is valued for dense, fine foliage and good growth.

Photos

Juniperus chinensis
📷 MPF at English Wikipedia · CC BY-SA 3.0 · source
Juniperus chinensis
📷 663highland · CC BY 2.5 · source
Juniperus chinensis
📷 Marco Mussita, some rights reserved (CC BY), uploaded by Mar · CC BY · source

Sources