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Sequoiadendron giganteum Greenpeace

Sequoiadendron giganteum Greenpeace
Giant Sequoia, Giant Redwood, Sierra Redwood, Wellingtonia

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A more compact variety of the famous California giant. Still reaching a height of about twenty meters, it has retained the majesty of the species with its very graphic pyramidal habit and its characteristic reddish-brown bark. Its foliage is a lighter green, very decorative in all seasons. Reserved for large gardens, this conifer adapts to all types of soil, well-drained and rather fertile, and prefers humid climates, but hot in summer. A beautiful tree for knowledgeable enthusiasts.
Height at maturity
20 m
Spread at maturity
7 m
Exposure
Sun, Partial shade
Hardiness
Hardy down to -23°C
Soil moisture
Moist soil
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Best planting time March, October
Recommended planting time February to May, September to November
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Description

The Sequoiadendron giganteum 'Greenpeace' differs from the botanical species due to its less significant growth. This relatively compactness makes it suitable for gardens large enough to allow it to be planted in isolation without hindering its development. Its foliage is also lighter than that of the species, but its other characteristics are comparable, including its distinctly pyramidal habit and its beautiful reddish-brown bark. It adapts to most soils, grows in full sun or partial shade in warm climates. While it appreciates some soil moisture, this tree tolerates moderate drought once well-rooted.

The Sequoiadendron giganteum is a conifer from the small family of Taxodiaceae (now integrated into the Cupressaceae family), alongside other genera of ornamental interest, such as Cryptomeria, Sciadopitys, Taxodium, or Cunninghamia with their unique foliage. Its common name of Giant Sequoia can be confusing with the Sequoia sempervirens, from the same botanical family but quite different. Apart from the fact that the latter surpasses it in height (although they are rarely compared side by side!), its foliage is spread out like that of the Yew, while that of the Sequoiadendron consists of small imbricate needles. The Sequoiadendron is native to North America, specifically the moist slopes of the Sierra Nevada mountains in California. Fossils attest to its presence in Europe before the major glaciers of the Quaternary. In natural conditions, it will reach a height of 50 to 85 m (164 to 279ft) with a spread of 8 to 10 m (26 to 33ft) and develop a massive pyramidal habit. This species shows relatively rapid growth and appreciates cool and moist climates, with hot summers and snowy winters that offer excellent protection to the roots and young plants.

The 'Greenpeace' variety is mainly distinguished from the wild species by its more limited growth and its foliage of a lighter green, which is decorative all year round (it does not change colour in winter). After 10 years of planting, it will reach a height of 3 to 5 m, with a rather narrow habit, but at maturity, it can reach a height of 20 m (66ft), widening from the base to take on a characteristic pyramidal habit with a spread of 7 m. Its main branches are slightly trailing, erect at their tips, covered with narrow and triangular, pointed needles, measuring 1 to 1.2 cm (1in) long, resembling those of Cypress trees. On young branches, they measure between 0.3 and 0.6 cm (1in). This plant is monoecious, meaning that there are male and female parts. When the female cones are pollinated, they take on an ovoid shape, a reddish-brown colour, and an upright posture. They mature in two years. Its trunk is a colossal pillar that takes on a fascinating appearance over time. The bark of this sequoia is remarkable, both for its reddish colour, its resistance to fire and fungal attacks, and the deep decorative blisters and crevices that form with age. 

This Sequoiadendron giganteum 'Greenpeace' will be planted in a sufficiently large garden to accommodate it. Its juvenile dimensions should not be misleading, it is a tall tree that requires space to develop properly. It should be mainly be planted as a standalone tree on a lawn, and after the first few years when watering may be necessary, it will require no maintenance or pruning. With its architectural habit and massive trunk over time, it will be well-suited to a contemporary garden where shapes and volumes take precedence over blooms or foliage. In a sufficiently large garden, it can create a beautiful scene alongside trees such as the Robinia pseudoacacia Frisia with its beautiful golden foliage that contrasts well with the Sequoiadendron's, or the Gleditsia triacanthos Sunburst with its fine, changing foliage, also golden in spring, then light green and yellow-orange in autumn. And to ignite autumn, an Acer rubrum Armstrong or Red Maple, depicting its autumnal livery, or a Liquidambar styraciflua Palo Alto, with its pyramidal silhouette and stylised leaves that will complement the architectural nature of our Sequoiadendron, while the scarlet green foliage of this Sweetgum will create a magnificent scene in the fine light green branches of the conifer.

 

Sequoiadendron giganteum Greenpeace in pictures

Sequoiadendron giganteum Greenpeace (Foliage) Foliage
Sequoiadendron giganteum Greenpeace (Plant habit) Plant habit

Plant habit

Height at maturity 20 m
Spread at maturity 7 m
Habit conical, pyramidal
Growth rate normal

Flowering

Flower colour insignificant

Foliage

Foliage persistence Evergreen
Foliage colour green

Botanical data

Genus

Sequoiadendron

Species

giganteum

Cultivar

Greenpeace

Family

Taxodiaceae

Other common names

Giant Sequoia, Giant Redwood, Sierra Redwood, Wellingtonia

Origin

Cultivar or hybrid

Product reference1008551

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Planting and care

The Sequoiadendron giganteum 'Greenpeace' should be planted from September to November and from February to April in deep, light, well-drained soil, close to neutrality, slightly limestone or slightly acidic, and relatively fertile. While it tolerates clay soils, it prefers loose and loamy or sandy soils, not limestone. Choose a sunny and well-cleared location, away from buildings, slightly more shaded in hot climates to provide some protection against heat during its young years.

Soak the root ball in a bucket of water until no more air bubbles rise to the surface. Dig a planting hole 60 x 60 cm (24in) wide and 70 cm (28in) deep and mix planting compost (optionally enriched with root stimulator) with the existing soil. Position the root ball in the hole (the surface of the root ball should be level with the existing soil), backfill and water generously. Add an organic base fertiliser to the plant and water thoroughly for the first three years and in case of prolonged drought. In poor soil, you can apply a special conifer fertiliser every 2 years in April. This hardy conifer (up to at least -25°C (1°F)) will not tolerate waterlogged, alkaline, or excessively dry soils in winter. However, it tolerates occasional summer drought once well established. Pruning is not necessary or desirable, so choosing a clear location from the start is essential to allow unrestricted growth.

Planting period

Best planting time March, October
Recommended planting time February to May, September to November

Intended location

Suitable for Meadow, Woodland edge
Type of use Free-standing
Hardiness Hardy down to -23°C (USDA zone 6a) Show map
Ease of cultivation Beginner
Planting density 1 per m2
Exposure Sun, Partial shade
Soil pH Neutral, Any
Soil type Silty-loamy (rich and light)
Soil moisture Moist soil, Deep, loose, well-drained soil

Care

Pruning No pruning necessary
Soil moisture Moist soil
Disease resistance Very good
Overwinter Can be left in the ground

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