Sequoiadendron giganteum 'GLAUCUM' Giant redwood, Sierra redwood, Giant sequoia
size/type
tall tree,tall tree
usual height
15-30m
usual width
3-5m
leaves
evergreen conifer
colour of leaves
location
full sun
USDA zone (lowest)
5 (down to -29°C)
winter protection
for zone 5+6
for zone 7
categorized
Giant redwood or Sierra redwood, sometimes concisely called the Big tree is truly a big tree. In fact, the biggest in the world ever measured. It comes from Sierra Nevada mountains in east California, USA, and all synonyms describing its giant size are in place. There is even a Wikipedia list of the largest living giant sequoias. They were all given names and two at its top have reached worldwide fame: General Sherman and General Grant. General Sherman tree is located in the Giant Forest Grove of Sequoia National Park, California, and according to data from 1997 it was 83.8m tall and 2300-2700 years old. Its ‘little’ brother nearby General Grant was ‘only’ some 1650 years old and 81.7m tall. However, historically the biggest tree was even 15-20% taller and was cut down in 1940’s, its name was Crannell Creek Giant.
Description of the plant:
Glaucum giant redwood is a smaller variety of this evergreen conifer with glaucous needles. It was first described by Christoph Friedrich Otto in 1860. Its habit is very narrowly conical even at older age. If sufficiently insolated also at its bottom parts it keeps its lower branched for a long time, otherwise it loses them, revealing very attractive, reddish-brown, fissured, bark. Evergreen leaves are awl-shaped and pointed at the tips, and scale-like, blue-green to silver blue, densely covering its thread-like twigs. Adult trees are noted for their great resistance to forest fires.Giant redwood is a specimen tree for large gardens and parks. Even though it can take some pruning when young, I have seen pruned trees and they are ugly. Leave it to its own devices, forming a magnificent centrepiece of your landscape, admired by lovers of monumental features. It loves full sun and plenty of space – never use it in a mixed border. It does not mind low temperatures, however, it dislikes significant temperature swings, especially in late winter without snow. A good help is an extra watering during a frost free day before a freezing night.
It is easy to grow. In fact, once transplanted it does not need ANY maintenance at all apart from occasional watering during the first 1-2 years until it establishes. It will grow in most well-drained soil types. It makes thick roots which make the trunk stable during strong winds. Its hardiness is commonly suggested to -29°C (USDA zone 5), but is expected to be a little better if the soil is covered with snow.
Last update 20-02-2020
