Juniperus chinensis

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Juniperus chinensis
Jun chin shoot.jpg
Chinese juniper shoot, showing juvenile (needle-like) leaves, adult scale leaves, and young male cones
Scientific classification edit
Kingdom: Plantae
Clade: Tracheophytes
Division: Pinophyta
Class: Pinopsida
Order: Pinales
Family: Cupressaceae
Genus: Juniperus
Section: Juniperus sect. Sabina
Species:
J. chinensis
Binomial name
Juniperus chinensis

Juniperus chinensis, the Chinese juniper (圆柏, 桧) is a species of plant in the cypress family Cupressaceae, native to China, Taiwan, Myanmar, Japan, Korea and the Russian Far East.[1] Growing 1–20 m (3.3–65.6 ft) tall, it is a very variable coniferous evergreen tree or shrub,

Growth[edit]

The leaves grow in two forms, juvenile needle-like leaves 5–10 mm long, and adult scale-leaves 1.5–3 mm long. Mature trees usually continue to bear some juvenile foliage as well as adult, particularly on shaded shoots low in the crown. This species is often dioecious (either male or female plants), but some individual plants produce both sexes of flowers. The blue-black berry-like cones grow to 7–12 mm in diameter, have a whitish waxy bloom, and contain 2–4 seeds; they mature in about 18 months. The male cones, 2–4 mm long, shed their pollen in early spring.

Cultivation and uses[edit]

This popular ornamental tree or shrub for gardens, parks, and in tough coastal conditions of hot sun and sandy fast-draining soils, has more than 100 named cultivars selected for various characteristics, such as yellow foliage (e.g. cvs. 'Aurea', 'Tremonia'), permanently juvenile foliage (e.g. cv. 'Shoosmith'), columnar crown shape (cv. 'Columnaris'), abundant cones (e.g. cv. 'Kaizuka'), etc. First popular in the United States in the Los Angeles gardens in Mediterranean style homes, and now commonly found along both the West and East Coast in beach and coastal areas.

The Chinese juniper is widely used in bonsai, both as individual plants, such as the 250-year-old "Omiya tree" in the Birmingham Botanical Gardens in the UK, and in groups, such as the well-known Goshin on display at the National Bonsai and Penjing Museum at the US National Arboretum. The cultivar 'Shimpaku' is a very important bonsai subject.

AGM cultivars[edit]

The following cultivars have gained the Royal Horticultural Society's Award of Garden Merit:-[2]

  • 'Aurea' (Golden Chinese juniper)[3]
  • 'Blaauw'[4]
  • 'Grey Owl'[5]
  • 'Kaizuka'[6]
  • 'Plumosa Aurea'[7]
  • 'Pyramidalis'[8]

The hybrid between Juniperus chinensis and Juniperus sabina, known as Juniperus × pfitzeriana (Pfitzer Juniper, synonym J. × media), is also very common as a cultivated plant. This hybrid grows only as a shrub, never a tree, making it suitable for smaller gardens:-

  • J. × pfitzeriana 'Old Gold' [9]
  • J. × pfitzeriana 'Sulphur Spray' [10]

Gallery[edit]

References[edit]

  1. ^ a b Farjon, A. (2013). "Juniperus chinensis". IUCN Red List of Threatened Species. 2013: e.T42227A2962948. Retrieved 14 April 2020.
  2. ^ "AGM Plants - Ornamental" (PDF). Royal Horticultural Society. July 2017. p. 56. Retrieved 14 March 2018.
  3. ^ "RHS Plant Selector Juniperus chinensis 'Aurea' AGM / RHS Gardening". Apps.rhs.org.uk. Retrieved 2020-09-16.
  4. ^ "RHS Plant Selector Juniperus chinensis 'Blaauw' AGM / RHS Gardening". Apps.rhs.org.uk. Retrieved 2020-09-16.
  5. ^ "RHS Plant Selector Juniperus 'Grey Owl' AGM / RHS Gardening". Apps.rhs.org.uk. Retrieved 2020-09-16.
  6. ^ "RHS Plant Selector Juniperus chinensis 'Kaizuka' AGM / RHS Gardening". Apps.rhs.org.uk. Retrieved 2020-09-16.
  7. ^ "RHS Plant Selector Juniperus chinensis 'Plumosa Aurea' AGM / RHS Gardening". Apps.rhs.org.uk. Retrieved 2020-09-16.
  8. ^ "RHS Plant Selector Juniperus chinensis 'Pyramidalis' AGM / RHS Gardening". Apps.rhs.org.uk. Retrieved 2020-09-16.
  9. '^ "Juniperus × pfizeriana 'Old Gold'". RHS. Retrieved 26 September 2020.
  10. ^ "Juniperus × pfizeriana 'Sulphur Spray'". RHS. Retrieved 26 September 2020.