Sequoiadendron giganteum 'Healthy Mammoth Three'

Trees

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A large, upright, evergreen conifer with a vigorous yet slender growth habit and dense, bright-green foliage. Hardy and drought-tolerant once established, with exceptional fungal resistance, it is the third cultivar in Cornelius Kools’ 'Healthy Mammoth' series

Position

Full sun, Partial shade

Soil Types

Clay, Loam

Size

Time to Maturity: 10–20 years

Growing Conditions

Clay Loam

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

Position

Full sun Partial shade

Aspect: East–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
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: Columnar upright
Genus: Sequoiadendron is a tall evergreen tree with soft, red-brown bark, flame-shaped when young, becoming more irregular with maturity. Short awl-shaped leaves are arranged spirally on the shoots, and ovoid cones become red-brown when mature
Name Status: Accepted

How to Grow

Cultivation

Grow in moderately fertile, well-drained soil in full sun or light dappled shade. See conifer cultivation

Propagation

Propagate by softwood cuttings in summer or semi-ripe cuttings in late summer or autumn

Suggested planting locations and garden types

Architectural
Low Maintenance

Pruning

No pruning required

Pests

Generally pest-free

Diseases

May be susceptible to honey fungus in gardens where it is present but insufficient data to determine degree of susceptibility