Sequoiadendron giganteum

RHS Plant Profile
giant redwood

Other common names

big tree, giant sequoia, mammoth tree, Sierra redwood, washingtonia, wellingtonia

Synonyms

Sequoia wellingtonia
Sequoia gigantea

Award of Garden Merit
Conifers Trees

A very large and long-lived evergreen tree that has been known to reach upwards of 90 metres or so in height in its natural region of origin. As a young tree it, has a densely branched, conical habit. As the tree matures, the branches are more widely spread and conspicuously downswept. It has sharp, blueish-green, awl-shaped leaves 6-12mm long arranged spirally round the shoots. Upright cones appear after flowering and when ripe, the reddish-brown cones (5-8cm) hang down. Ideally suited to being planted as a specimen in a large park or garden.

Position

Full sun, Partial shade

Soil Types

Loam, Sand, Clay

Max Height

Higher than 12 metres

Max Spread

wider than 8 metres

Size

Time to Maturity
20–50 years
Max Spread
wider than 8 metres
Max Height
Higher than 12 metres

Growing Conditions

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

Position

Full sun Partial shade
Aspect
North–facing or West–facing or South–facing or East–facing
Exposure
Exposed or Sheltered
Hardiness
H6

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Cupressaceae
Native to GB/Ireland
No
Foliage
Evergreen
Habit
Bushy
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
Correct
Plant Range
USA (California)

How to Grow

Cultivation

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

Propagation

Propagate by seed in containers in a cold frame in spring. Root softwood cuttings in summer or semi-ripe cuttings in late summer

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