Juniperus formosana

RHS Plant Profile

Taiwan juniper

Conifers Trees

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A slow-growing evergreen tree of narrow upright habit with short weeping branches to around 8-10m. Foliage is grey-green in colour. Mature trees have peeling bark.

Position

Full sun, Partial shade

Soil Types

Chalk, Clay, Loam, Sand

Max Height

4-8 metres

Max Spread

2.5-4 metres

Size

Time to Maturity: 10–20 years
Max Spread: 2.5-4 metres
Max Height: 4-8 metres

Growing Conditions

Chalk Clay Loam Sand

Moisture: Moist but well–drained or Well–drained
pH: Acid or Alkaline or Neutral

Position

Full sun Partial shade

Aspect: East–facing or South–facing or West–facing
Exposure: Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

H1A: under glass all year (>15C)
H1B: can be grown outside in the summer (10 - 15)
H1C: can be grown outside in the summer (5 - 10)
H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
H4: hardy through most of the UK (-10 to -5)
H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
H6: hardy in all of UK and northern Europe (-20 to -15)
H7: hardy in the severest European continental climates (< -20): H3
Drought Resistance: Yes

Colour & Scent

Season	Stem	Flower	Foliage	Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family: Cupressaceae
Native to GB/Ireland: No
Foliage: Evergreen
Habit: Pendulous weeping
Potentially harmful: Harmful if eaten/skin allergen. Wear gloves and other protective equipment when handling
Genus: Juniperus can be prostrate or erect, evergreen shrubs or trees with aromatic, scale-like or sharply pointed awl-shaped leaves, and small globose fruits
Name Status: Correct
Plant Range: China (Fujian) to Taiwan

How to Grow

Cultivation

Grow in any well-drained soil, including dry, chalky or sandy soils, preferably in full sun or in light dappled shade. Borderline hardy (sheltered or coastal locations). See tree cultivation

Propagation

Propagate by semi-hardwood cuttings in early autumn

Suggested planting locations and garden types

Architectural
City and courtyard gardens
Coastal
Low Maintenance
Wall side borders

Pruning

See pruning group 1

Pests

May be susceptible to aphids, scale insects, conifer red spider mite and caterpillars

Diseases

May be susceptible to phytophthora, canker and honey fungus. See also Conifers: brown patches