Thuja occidentalis 'Jantar'PBR

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white cedar 'Jantar'

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white cedar 'Jantar' RHS / Joanna Kossak
white cedar 'Jantar' RHS / Joanna Kossak
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A compact, columnar, evergreen coniferous tree, slowly growing to a maximum height of 1.8m (6ft) and 1m (39in) across. Producing dense, flat sparays of bright yellow-green foliage, turning to a warm, amber shade in autumn. Its strictly conical form is useful as an architectural focal point in a garden, as well as being a good addition to city and courtyard gardens, where ultimate size is an important consideration

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

2.5-4 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity
10–20 years
Max Spread
1.5-2.5 metres
Max Height
2.5-4 metres

Growing Conditions

Chalk Clay Loam Sand
Moisture
Moist but well–drained
pH
Acid or Alkaline or Neutral

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Exposed or 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)
H6

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Cupressaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Columnar upright
Potentially harmful
Harmful if eatenskin allergen. Wear gloves and other protective equipment when handling
Genus
Thuja are fast-growing evergreen trees of narrowly conical habit, with flat sprays of tiny, aromatic, scale-like leaves and small knobbly cones
Name Status
Accepted

How to Grow

Cultivation

Grows well in any moist, but well-drained soil in full sun

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

  • Architectural
  • City and courtyard gardens
  • Cottage and informal garden
  • Patio and container plants
  • Low Maintenance
  • Flower borders and beds
  • Hedging and screens

Pruning

No pruning required unless grown as hedging. See: hedges and trimming hedges

Pests

May be susceptible to scale insects and conifer aphids

Diseases

May be susceptible to honey fungus and other fungal diseases, particularly thuja blight and Coryneum canker (see conifers: brown patches)