Thuja occidentalis 'Degroot's Spire'

RHS Plant Profile

white cedar 'Degroot's Spire'

Conifers

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A compact, slow-growing conifer forming a narrow column up to 9m tall with twisted sprays of scale-like green foliage that may be tinged purple in winter; leaves have a fruity fragrance when crushed

Position

Full sun

Soil Types

Chalk, Clay, Loam, Sand

Max Height

8-12 metres

Max Spread

1.5-2.5 metres

Size

Time to Maturity: 10–20 years
Max Spread: 1.5-2.5 metres
Max Height: 8-12 metres

Growing Conditions

Chalk Clay Loam Sand

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

Position

Full sun

Aspect: East–facing or North–facing or 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): H7

Colour & Scent

Fragrance Foliage

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

Grow in a moist but well-drained soil in full sun. Protect from drying winds, especially when young

Propagation

Propagate by semi-hardwood cuttings

Suggested planting locations and garden types

Patio and container plants
Rock garden
Low Maintenance
Hedging and screens

Pruning

No pruning required

Pests

May be susceptible to aphids and scale insects

Diseases

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